645604292 has 6 divisors (see below), whose sum is σ = 1129807518. Its totient is φ = 322802144.

The previous prime is 645604283. The next prime is 645604307. The reversal of 645604292 is 292406546.

645604292 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 533794816 + 111809476 = 23104^2 + 10574^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80700533 + ... + 80700540.

It is an arithmetic number, because the mean of its divisors is an integer number (188301253).

Almost surely, 2^645604292 is an apocalyptic number.

It is an amenable number.

645604292 is a deficient number, since it is larger than the sum of its proper divisors (484203226).

645604292 is a wasteful number, since it uses less digits than its factorization.

645604292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161401077 (or 161401075 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 645604292 is about 25408.7444003044. The cubic root of 645604292 is about 864.2820027825.

The spelling of 645604292 in words is "six hundred forty-five million, six hundred four thousand, two hundred ninety-two".