28776658896 has 60 divisors (see below), whose sum is σ = 80668921060. Its totient is φ = 9576230400.

The previous prime is 28776658891. The next prime is 28776658921. The reversal of 28776658896 is 69885667782.

It can be written as a sum of positive squares in 2 ways, for example, as 18397124496 + 10379534400 = 135636^2 + 101880^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28776658891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79711 + ... + 252798.

Almost surely, 2^28776658896 is an apocalyptic number.

It is an amenable number.

28776658896 is an abundant number, since it is smaller than the sum of its proper divisors (51892262164).

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

28776658896 is a wasteful number, since it uses less digits than its factorization.

28776658896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333124 (or 333115 counting only the distinct ones).

The product of its digits is 487710720, while the sum is 72.

The spelling of 28776658896 in words is "twenty-eight billion, seven hundred seventy-six million, six hundred fifty-eight thousand, eight hundred ninety-six".