28776658968 has 64 divisors (see below), whose sum is σ = 80187516000. Its totient is φ = 9561937536.

The previous prime is 28776658957. The next prime is 28776659003. The reversal of 28776658968 is 86985667782.

It is a super-2 number, since 2×28776658968² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 28776658896 and 28776658905.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 141663 + ... + 278606.

Almost surely, 2^28776658968 is an apocalyptic number.

It is an amenable number.

28776658968 is an abundant number, since it is smaller than the sum of its proper divisors (51410857032).

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

28776658968 is a wasteful number, since it uses less digits than its factorization.

28776658968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420601 (or 420591 counting only the distinct ones).

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

The spelling of 28776658968 in words is "twenty-eight billion, seven hundred seventy-six million, six hundred fifty-eight thousand, nine hundred sixty-eight".