628639585 has 8 divisors (see below), whose sum is σ = 862134336. Its totient is φ = 431067120.

The previous prime is 628639559. The next prime is 628639601. The reversal of 628639585 is 585936826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628639585 - 2⁷ = 628639457 is a prime.

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, 8980531 + ... + 8980600.

It is an arithmetic number, because the mean of its divisors is an integer number (107766792).

Almost surely, 2^628639585 is an apocalyptic number.

It is an amenable number.

628639585 is a deficient number, since it is larger than the sum of its proper divisors (233494751).

628639585 is a wasteful number, since it uses less digits than its factorization.

628639585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17961143.

The product of its digits is 3110400, while the sum is 52.

The square root of 628639585 is about 25072.6860348069. The cubic root of 628639585 is about 856.6443896125.

The spelling of 628639585 in words is "six hundred twenty-eight million, six hundred thirty-nine thousand, five hundred eighty-five".