28352940 has 288 divisors, whose sum is σ = 110605824. Its totient is φ = 5253120.

The previous prime is 28352903. The next prime is 28352963. The reversal of 28352940 is 4925382.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1492251 + ... + 1492269.

It is an arithmetic number, because the mean of its divisors is an integer number (384048).

Almost surely, 2^28352940 is an apocalyptic number.

28352940 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 28352940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55302912).

28352940 is an abundant number, since it is smaller than the sum of its proper divisors (82252884).

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

28352940 is a wasteful number, since it uses less digits than its factorization.

28352940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 28352940 is about 5324.7478813555. The cubic root of 28352940 is about 304.9294470868.

It can be divided in two parts, 28352 and 940, that added together give a palindrome (29292).

The spelling of 28352940 in words is "twenty-eight million, three hundred fifty-two thousand, nine hundred forty".