28956240 has 120 divisors (see below), whose sum is σ = 98306208. Its totient is φ = 7637760.

The previous prime is 28956229. The next prime is 28956251. The reversal of 28956240 is 4265982.

It is a happy number.

28956240 is a `hidden beast` number, since 28 + 9 + 5 + 624 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28956229) and next prime (28956251).

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 = 28956195 and 28956204.

It is a congruent number.

It is an unprimeable number.

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, 94167 + ... + 94473.

Almost surely, 2^28956240 is an apocalyptic number.

28956240 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 28956240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49153104).

28956240 is an abundant number, since it is smaller than the sum of its proper divisors (69349968).

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

28956240 is a wasteful number, since it uses less digits than its factorization.

28956240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 28956240 is about 5381.1002592407. The cubic root of 28956240 is about 307.0770707696.

The spelling of 28956240 in words is "twenty-eight million, nine hundred fifty-six thousand, two hundred forty".