628031916 has 18 divisors (see below), whose sum is σ = 1587525212. Its totient is φ = 209343960.

The previous prime is 628031903. The next prime is 628031923. The reversal of 628031916 is 619130826.

628031916 is a `hidden beast` number, since 628 + 0 + 3 + 19 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17445331 = 628031916 / (6 + 2 + 8 + 0 + 3 + 1 + 9 + 1 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8722630 + ... + 8722701.

Almost surely, 2^628031916 is an apocalyptic number.

It is an amenable number.

628031916 is an abundant number, since it is smaller than the sum of its proper divisors (959493296).

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

628031916 is a wasteful number, since it uses less digits than its factorization.

628031916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17445341 (or 17445336 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 628031916 is about 25060.5649577179. The cubic root of 628031916 is about 856.3682780044.

The spelling of 628031916 in words is "six hundred twenty-eight million, thirty-one thousand, nine hundred sixteen".