645336507 has 64 divisors (see below), whose sum is σ = 1002792960. Its totient is φ = 366643200.

The previous prime is 645336493. The next prime is 645336511. The reversal of 645336507 is 705633546.

It is not a de Polignac number, because 645336507 - 2⁶ = 645336443 is a prime.

It is a super-2 number, since 2×645336507² = 832918414533922098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (645336547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2074882 + ... + 2075192.

It is an arithmetic number, because the mean of its divisors is an integer number (15668640).

Almost surely, 2^645336507 is an apocalyptic number.

645336507 is a deficient number, since it is larger than the sum of its proper divisors (357456453).

645336507 is a wasteful number, since it uses less digits than its factorization.

645336507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 226800, while the sum is 39.

The square root of 645336507 is about 25403.4743096294. The cubic root of 645336507 is about 864.1624900687.

The spelling of 645336507 in words is "six hundred forty-five million, three hundred thirty-six thousand, five hundred seven".