28670956578 has 24 divisors (see below), whose sum is σ = 67767716016. Its totient is φ = 8688168600.

The previous prime is 28670956553. The next prime is 28670956607. The reversal of 28670956578 is 87565907682.

28670956578 is a `hidden beast` number, since 2 + 8 + 6 + 7 + 0 + 9 + 56 + 578 = 666.

It is a super-2 number, since 2×28670956578² (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 11 ways as a sum of consecutive naturals, for example, 72401208 + ... + 72401603.

It is an arithmetic number, because the mean of its divisors is an integer number (2823654834).

Almost surely, 2^28670956578 is an apocalyptic number.

28670956578 is an abundant number, since it is smaller than the sum of its proper divisors (39096759438).

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

28670956578 is a wasteful number, since it uses less digits than its factorization.

28670956578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144802830 (or 144802827 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 28670956578 in words is "twenty-eight billion, six hundred seventy million, nine hundred fifty-six thousand, five hundred seventy-eight".