645887200 has 72 divisors (see below), whose sum is σ = 1802040912. Its totient is φ = 221445120.

The previous prime is 645887191. The next prime is 645887233. The reversal of 645887200 is 2788546.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52069 + ... + 63268.

It is an arithmetic number, because the mean of its divisors is an integer number (25028346).

Almost surely, 2^645887200 is an apocalyptic number.

It is an amenable number.

645887200 is an abundant number, since it is smaller than the sum of its proper divisors (1156153712).

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

645887200 is a wasteful number, since it uses less digits than its factorization.

645887200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115364 (or 115351 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 645887200 is about 25414.3109290809. The cubic root of 645887200 is about 864.4082290116.

The spelling of 645887200 in words is "six hundred forty-five million, eight hundred eighty-seven thousand, two hundred".