645175316 has 24 divisors (see below), whose sum is σ = 1137249960. Its totient is φ = 320256000.

The previous prime is 645175283. The next prime is 645175411. The reversal of 645175316 is 613571546.

It can be written as a sum of positive squares in 4 ways, for example, as 385965316 + 259210000 = 19646^2 + 16100^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 645175316.

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, 385730 + ... + 387398.

It is an arithmetic number, because the mean of its divisors is an integer number (47385415).

Almost surely, 2^645175316 is an apocalyptic number.

It is an amenable number.

645175316 is a deficient number, since it is larger than the sum of its proper divisors (492074644).

645175316 is a wasteful number, since it uses less digits than its factorization.

645175316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315 (or 2313 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 645175316 is about 25400.3014942736. The cubic root of 645175316 is about 864.0905344230.

The spelling of 645175316 in words is "six hundred forty-five million, one hundred seventy-five thousand, three hundred sixteen".