3128797687956 has 48 divisors (see below), whose sum is σ = 7932661954560. Its totient is φ = 956169070560.

The previous prime is 3128797687943. The next prime is 3128797687969. The reversal of 3128797687956 is 6597867978213.

It is an interprime number because it is at equal distance from previous prime (3128797687943) and next prime (3128797687969).

It is a super-2 number, since 2×3128797687956² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221328366 + ... + 221342501.

It is an arithmetic number, because the mean of its divisors is an integer number (165263790720).

Almost surely, 2^{3128797687956} is an apocalyptic number.

It is an amenable number.

3128797687956 is an abundant number, since it is smaller than the sum of its proper divisors (4803864266604).

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

3128797687956 is a wasteful number, since it uses less digits than its factorization.

3128797687956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442670924 (or 442670922 counting only the distinct ones).

The product of its digits is 1920360960, while the sum is 78.

The spelling of 3128797687956 in words is "three trillion, one hundred twenty-eight billion, seven hundred ninety-seven million, six hundred eighty-seven thousand, nine hundred fifty-six".