645790376 has 32 divisors (see below), whose sum is σ = 1509641280. Its totient is φ = 251606400.

The previous prime is 645790363. The next prime is 645790391. The reversal of 645790376 is 673097546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 645790376.

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, 523565 + ... + 524796.

It is an arithmetic number, because the mean of its divisors is an integer number (47176290).

Almost surely, 2^645790376 is an apocalyptic number.

It is an amenable number.

645790376 is an abundant number, since it is smaller than the sum of its proper divisors (863850904).

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

645790376 is a wasteful number, since it uses less digits than its factorization.

645790376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048385 (or 1048381 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 47.

The square root of 645790376 is about 25412.4059467025. The cubic root of 645790376 is about 864.3650327977.

The spelling of 645790376 in words is "six hundred forty-five million, seven hundred ninety thousand, three hundred seventy-six".