645738708 has 48 divisors (see below), whose sum is σ = 1626468480. Its totient is φ = 198785664.

The previous prime is 645738707. The next prime is 645738749. The reversal of 645738708 is 807837546.

645738708 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645738707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32335 + ... + 48342.

It is an arithmetic number, because the mean of its divisors is an integer number (33884760).

Almost surely, 2^645738708 is an apocalyptic number.

It is an amenable number.

645738708 is an abundant number, since it is smaller than the sum of its proper divisors (980729772).

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

645738708 is a wasteful number, since it uses less digits than its factorization.

645738708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80736 (or 80734 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The square root of 645738708 is about 25411.3893362799. The cubic root of 645738708 is about 864.3419803206.

The spelling of 645738708 in words is "six hundred forty-five million, seven hundred thirty-eight thousand, seven hundred eight".