645747402 has 16 divisors (see below), whose sum is σ = 1347647040. Its totient is φ = 205890432.

The previous prime is 645747373. The next prime is 645747413. The reversal of 645747402 is 204747546.

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, 2339527 + ... + 2339802.

It is an arithmetic number, because the mean of its divisors is an integer number (84227940).

Almost surely, 2^645747402 is an apocalyptic number.

645747402 is an abundant number, since it is smaller than the sum of its proper divisors (701899638).

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

645747402 is a wasteful number, since it uses less digits than its factorization.

645747402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4679357.

The product of its (nonzero) digits is 188160, while the sum is 39.

The square root of 645747402 is about 25411.5604007310. The cubic root of 645747402 is about 864.3458593692.

The spelling of 645747402 in words is "six hundred forty-five million, seven hundred forty-seven thousand, four hundred two".