645174988 has 12 divisors (see below), whose sum is σ = 1143348640. Its totient is φ = 318503952.

The previous prime is 645174983. The next prime is 645174991. The reversal of 645174988 is 889471546.

645174988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645174983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020531 + ... + 1021162.

Almost surely, 2^645174988 is an apocalyptic number.

It is an amenable number.

645174988 is a deficient number, since it is larger than the sum of its proper divisors (498173652).

645174988 is a wasteful number, since it uses less digits than its factorization.

645174988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041776 (or 2041774 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The square root of 645174988 is about 25400.2950376566. The cubic root of 645174988 is about 864.0903879917.

The spelling of 645174988 in words is "six hundred forty-five million, one hundred seventy-four thousand, nine hundred eighty-eight".