645882864 has 40 divisors (see below), whose sum is σ = 1820216832. Its totient is φ = 195721920.

The previous prime is 645882859. The next prime is 645882869. The reversal of 645882864 is 468288546.

It is an interprime number because it is at equal distance from previous prime (645882859) and next prime (645882869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645882869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611104 + ... + 612159.

Almost surely, 2^645882864 is an apocalyptic number.

It is an amenable number.

645882864 is an abundant number, since it is smaller than the sum of its proper divisors (1174333968).

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

645882864 is a wasteful number, since it uses less digits than its factorization.

645882864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223285 (or 1223279 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 51.

The square root of 645882864 is about 25414.2256226705. The cubic root of 645882864 is about 864.4062946788.

The spelling of 645882864 in words is "six hundred forty-five million, eight hundred eighty-two thousand, eight hundred sixty-four".