645464208 has 20 divisors (see below), whose sum is σ = 1667449328. Its totient is φ = 215154720.

The previous prime is 645464201. The next prime is 645464213. The reversal of 645464208 is 802464546.

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

It is not an unprimeable number, because it can be changed into a prime (645464201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6723538 + ... + 6723633.

Almost surely, 2^645464208 is an apocalyptic number.

It is an amenable number.

645464208 is an abundant number, since it is smaller than the sum of its proper divisors (1021985120).

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

645464208 is a wasteful number, since it uses less digits than its factorization.

645464208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13447182 (or 13447176 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The square root of 645464208 is about 25405.9876407118. The cubic root of 645464208 is about 864.2194872760.

The spelling of 645464208 in words is "six hundred forty-five million, four hundred sixty-four thousand, two hundred eight".