645860630 has 16 divisors (see below), whose sum is σ = 1163579904. Its totient is φ = 258115200.

The previous prime is 645860623. The next prime is 645860647. The reversal of 645860630 is 36068546.

It is a Curzon number.

It is a congruent number.

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, 16547 + ... + 39566.

It is an arithmetic number, because the mean of its divisors is an integer number (72723744).

Almost surely, 2^645860630 is an apocalyptic number.

645860630 is a deficient number, since it is larger than the sum of its proper divisors (517719274).

645860630 is a wasteful number, since it uses less digits than its factorization.

645860630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57271.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 645860630 is about 25413.7881867304. The cubic root of 645860630 is about 864.3963757336.

The spelling of 645860630 in words is "six hundred forty-five million, eight hundred sixty thousand, six hundred thirty".