645256952 has 32 divisors (see below), whose sum is σ = 1220313600. Its totient is φ = 319853184.

The previous prime is 645256943. The next prime is 645256991. The reversal of 645256952 is 259652546.

It is a congruent number.

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, 603074 + ... + 604142.

It is an arithmetic number, because the mean of its divisors is an integer number (38134800).

Almost surely, 2^645256952 is an apocalyptic number.

It is an amenable number.

645256952 is a deficient number, since it is larger than the sum of its proper divisors (575056648).

645256952 is a wasteful number, since it uses less digits than its factorization.

645256952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1651 counting only the distinct ones).

The product of its digits is 648000, while the sum is 44.

The square root of 645256952 is about 25401.9084322419. The cubic root of 645256952 is about 864.1269782227.

The spelling of 645256952 in words is "six hundred forty-five million, two hundred fifty-six thousand, nine hundred fifty-two".