28431802532 has 18 divisors (see below), whose sum is σ = 57879026982. Its totient is φ = 12185058144.

The previous prime is 28431802523. The next prime is 28431802549. The reversal of 28431802532 is 23520813482.

It can be written as a sum of positive squares in only one way, i.e., 24678524836 + 3753277696 = 157094^2 + 61264^2 .

It is a super-2 number, since 2×28431802532² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72529913 + ... + 72530304.

It is an arithmetic number, because the mean of its divisors is an integer number (3215501499).

Almost surely, 2^28431802532 is an apocalyptic number.

It is an amenable number.

28431802532 is an abundant number, since it is smaller than the sum of its proper divisors (29447224450).

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

28431802532 is a wasteful number, since it uses less digits than its factorization.

28431802532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145060235 (or 145060226 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 28431802532 in words is "twenty-eight billion, four hundred thirty-one million, eight hundred two thousand, five hundred thirty-two".