628657590 has 32 divisors (see below), whose sum is σ = 1645940736. Its totient is φ = 152401760.

The previous prime is 628657559. The next prime is 628657669. The reversal of 628657590 is 95756826.

It is a happy number.

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, 952182 + ... + 952841.

It is an arithmetic number, because the mean of its divisors is an integer number (51435648).

Almost surely, 2^628657590 is an apocalyptic number.

628657590 is an abundant number, since it is smaller than the sum of its proper divisors (1017283146).

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

628657590 is a wasteful number, since it uses less digits than its factorization.

628657590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905044.

The product of its (nonzero) digits is 907200, while the sum is 48.

The square root of 628657590 is about 25073.0450883015. The cubic root of 628657590 is about 856.6525679791.

The spelling of 628657590 in words is "six hundred twenty-eight million, six hundred fifty-seven thousand, five hundred ninety".