628976820931 has 16 divisors (see below), whose sum is σ = 643723784704. Its totient is φ = 614437933824.

The previous prime is 628976820887. The next prime is 628976820973. The reversal of 628976820931 is 139028679826.

It is a cyclic number.

It is not a de Polignac number, because 628976820931 - 2¹⁵ = 628976788163 is a prime.

It is a super-4 number, since 4×628976820931⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628976820931.

It is not an unprimeable number, because it can be changed into a prime (628976820331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2964706 + ... + 3169768.

It is an arithmetic number, because the mean of its divisors is an integer number (40232736544).

Almost surely, 2^628976820931 is an apocalyptic number.

628976820931 is a deficient number, since it is larger than the sum of its proper divisors (14746963773).

628976820931 is a wasteful number, since it uses less digits than its factorization.

628976820931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205570.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 628976820931 in words is "six hundred twenty-eight billion, nine hundred seventy-six million, eight hundred twenty thousand, nine hundred thirty-one".