28857432 has 32 divisors (see below), whose sum is σ = 76388400. Its totient is φ = 9053184.

The previous prime is 28857421. The next prime is 28857443. The reversal of 28857432 is 23475882.

It is an interprime number because it is at equal distance from previous prime (28857421) and next prime (28857443).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 34957 + ... + 35772.

Almost surely, 2^28857432 is an apocalyptic number.

It is an amenable number.

28857432 is an abundant number, since it is smaller than the sum of its proper divisors (47530968).

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

28857432 is a wasteful number, since it uses less digits than its factorization.

28857432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70755 (or 70751 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 28857432 is about 5371.9113916743. The cubic root of 28857432 is about 306.7273908315.

The spelling of 28857432 in words is "twenty-eight million, eight hundred fifty-seven thousand, four hundred thirty-two".