628740665 has 16 divisors (see below), whose sum is σ = 912995712. Its totient is φ = 405775104.

The previous prime is 628740661. The next prime is 628740709. The reversal of 628740665 is 566047826.

It is not a de Polignac number, because 628740665 - 2² = 628740661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628740661) 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, 527759 + ... + 528948.

It is an arithmetic number, because the mean of its divisors is an integer number (57062232).

Almost surely, 2^628740665 is an apocalyptic number.

It is an amenable number.

628740665 is a deficient number, since it is larger than the sum of its proper divisors (284255047).

628740665 is a wasteful number, since it uses less digits than its factorization.

628740665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056736.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 628740665 is about 25074.7016931408. The cubic root of 628740665 is about 856.6903009086.

The spelling of 628740665 in words is "six hundred twenty-eight million, seven hundred forty thousand, six hundred sixty-five".