28770432 has 32 divisors (see below), whose sum is σ = 76422480. Its totient is φ = 9590016.

The previous prime is 28770421. The next prime is 28770433. The reversal of 28770432 is 23407782.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 28770393 and 28770402.

It is not an unprimeable number, because it can be changed into a prime (28770433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37078 + ... + 37845.

Almost surely, 2^28770432 is an apocalyptic number.

It is an amenable number.

28770432 is an abundant number, since it is smaller than the sum of its proper divisors (47652048).

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

28770432 is an equidigital number, since it uses as much as digits as its factorization.

28770432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74940 (or 74928 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 28770432 is about 5363.8076028135. The cubic root of 28770432 is about 306.4188377913.

The spelling of 28770432 in words is "twenty-eight million, seven hundred seventy thousand, four hundred thirty-two".