645740470 has 32 divisors (see below), whose sum is σ = 1188846720. Its totient is φ = 252470400.

The previous prime is 645740453. The next prime is 645740483. The reversal of 645740470 is 74047546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75744 + ... + 83836.

It is an arithmetic number, because the mean of its divisors is an integer number (37151460).

Almost surely, 2^645740470 is an apocalyptic number.

645740470 is a deficient number, since it is larger than the sum of its proper divisors (543106250).

645740470 is a wasteful number, since it uses less digits than its factorization.

645740470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8280.

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 645740470 is about 25411.4240057499. The cubic root of 645740470 is about 864.3427664844.

The spelling of 645740470 in words is "six hundred forty-five million, seven hundred forty thousand, four hundred seventy".