28879755957 has 30 divisors (see below), whose sum is σ = 46468803458. Its totient is φ = 17768763936.

The previous prime is 28879755953. The next prime is 28879755967. The reversal of 28879755957 is 75955797882.

28879755957 is a `hidden beast` number, since 28 + 8 + 7 + 9 + 7 + 5 + 595 + 7 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 9030890961 + 19848864996 = 95031^2 + 140886^2 .

It is not a de Polignac number, because 28879755957 - 2² = 28879755953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28879755953) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5511943 + ... + 5517179.

Almost surely, 2^28879755957 is an apocalyptic number.

28879755957 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28879755957 is a deficient number, since it is larger than the sum of its proper divisors (17589047501).

28879755957 is an frugal number, since it uses more digits than its factorization.

28879755957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10499 (or 5253 counting only the distinct ones).

The product of its digits is 444528000, while the sum is 72.

The spelling of 28879755957 in words is "twenty-eight billion, eight hundred seventy-nine million, seven hundred fifty-five thousand, nine hundred fifty-seven".