28357672772 has 72 divisors (see below), whose sum is σ = 58990372056. Its totient is φ = 11848320000.

The previous prime is 28357672769. The next prime is 28357672799. The reversal of 28357672772 is 27727675382.

It can be written as a sum of positive squares in 4 ways, for example, as 636754756 + 27720918016 = 25234^2 + 166496^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1507022 + ... + 1525722.

It is an arithmetic number, because the mean of its divisors is an integer number (819310723).

Almost surely, 2^28357672772 is an apocalyptic number.

28357672772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28357672772 is an abundant number, since it is smaller than the sum of its proper divisors (30632699284).

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

28357672772 is a wasteful number, since it uses less digits than its factorization.

28357672772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18981 (or 18968 counting only the distinct ones).

The product of its digits is 13829760, while the sum is 56.

The spelling of 28357672772 in words is "twenty-eight billion, three hundred fifty-seven million, six hundred seventy-two thousand, seven hundred seventy-two".