28673443656 has 96 divisors (see below), whose sum is σ = 91233717120. Its totient is φ = 8020540800.

The previous prime is 28673443637. The next prime is 28673443661. The reversal of 28673443656 is 65634437682.

28673443656 is a `hidden beast` number, since 2 + 86 + 73 + 443 + 6 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1382160 + ... + 1402751.

It is an arithmetic number, because the mean of its divisors is an integer number (950351220).

Almost surely, 2^28673443656 is an apocalyptic number.

28673443656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28673443656 is an abundant number, since it is smaller than the sum of its proper divisors (62560273464).

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

28673443656 is a wasteful number, since it uses less digits than its factorization.

28673443656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784947 (or 2784940 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 54.

The spelling of 28673443656 in words is "twenty-eight billion, six hundred seventy-three million, four hundred forty-three thousand, six hundred fifty-six".