645701376 has 36 divisors (see below), whose sum is σ = 1718509352. Its totient is φ = 215233536.

The previous prime is 645701359. The next prime is 645701389. The reversal of 645701376 is 673107546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419611 + ... + 421146.

Almost surely, 2^645701376 is an apocalyptic number.

It is an amenable number.

645701376 is an abundant number, since it is smaller than the sum of its proper divisors (1072807976).

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

645701376 is an equidigital number, since it uses as much as digits as its factorization.

645701376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840776 (or 840762 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 645701376 is about 25410.6547731459. The cubic root of 645701376 is about 864.3253233063.

The spelling of 645701376 in words is "six hundred forty-five million, seven hundred one thousand, three hundred seventy-six".