28557532 has 12 divisors (see below), whose sum is σ = 52606120. Its totient is φ = 13527216.

The previous prime is 28557523. The next prime is 28557539. The reversal of 28557532 is 23575582.

It is a junction number, because it is equal to n+sod(n) for n = 28557491 and 28557500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557539) 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 3 ways as a sum of consecutive naturals, for example, 187803 + ... + 187954.

Almost surely, 2^28557532 is an apocalyptic number.

It is an amenable number.

28557532 is a deficient number, since it is larger than the sum of its proper divisors (24048588).

28557532 is a wasteful number, since it uses less digits than its factorization.

28557532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375780 (or 375778 counting only the distinct ones).

The product of its digits is 84000, while the sum is 37.

The square root of 28557532 is about 5343.9247749196. The cubic root of 28557532 is about 305.6611368369.

The spelling of 28557532 in words is "twenty-eight million, five hundred fifty-seven thousand, five hundred thirty-two".