628139578 has 16 divisors (see below), whose sum is σ = 1030321440. Its totient is φ = 284835600.

The previous prime is 628139549. The next prime is 628139581. The reversal of 628139578 is 875931826.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24648 + ... + 43171.

It is an arithmetic number, because the mean of its divisors is an integer number (64395090).

Almost surely, 2^628139578 is an apocalyptic number.

628139578 is a deficient number, since it is larger than the sum of its proper divisors (402181862).

628139578 is a wasteful number, since it uses less digits than its factorization.

628139578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68253.

The product of its digits is 725760, while the sum is 49.

The square root of 628139578 is about 25062.7129018389. The cubic root of 628139578 is about 856.4172102594.

The spelling of 628139578 in words is "six hundred twenty-eight million, one hundred thirty-nine thousand, five hundred seventy-eight".