28992240 has 120 divisors (see below), whose sum is σ = 98983248. Its totient is φ = 7603200.

The previous prime is 28992239. The next prime is 28992241. The reversal of 28992240 is 4229982.

It is an interprime number because it is at equal distance from previous prime (28992239) and next prime (28992241).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28992195 and 28992204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28992241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47940 + ... + 48540.

Almost surely, 2^28992240 is an apocalyptic number.

28992240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28992240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49491624).

28992240 is an abundant number, since it is smaller than the sum of its proper divisors (69991008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28992240 is a wasteful number, since it uses less digits than its factorization.

28992240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28992240 is about 5384.4442610171. Note that the first 3 decimals coincide. The cubic root of 28992240 is about 307.2042764704.

It can be divided in two parts, 289 and 92240, that added together give a palindrome (92529).

The spelling of 28992240 in words is "twenty-eight million, nine hundred ninety-two thousand, two hundred forty".