28764757764 has 18 divisors (see below), whose sum is σ = 72710915550. Its totient is φ = 9588252576.

The previous prime is 28764757759. The next prime is 28764757783. The reversal of 28764757764 is 46775746782.

28764757764 is a `hidden beast` number, since 28 + 76 + 475 + 7 + 76 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26722440900 + 2042316864 = 163470^2 + 45192^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×28764757764² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399510489 + ... + 399510560.

Almost surely, 2^28764757764 is an apocalyptic number.

It is an amenable number.

28764757764 is an abundant number, since it is smaller than the sum of its proper divisors (43946157786).

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

28764757764 is a wasteful number, since it uses less digits than its factorization.

28764757764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799021059 (or 799021054 counting only the distinct ones).

The product of its digits is 110638080, while the sum is 63.

The spelling of 28764757764 in words is "twenty-eight billion, seven hundred sixty-four million, seven hundred fifty-seven thousand, seven hundred sixty-four".