645629376 has 56 divisors (see below), whose sum is σ = 1952264320. Its totient is φ = 184465152.

The previous prime is 645629363. The next prime is 645629393. The reversal of 645629376 is 673926546.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 238846 + ... + 241533.

Almost surely, 2^645629376 is an apocalyptic number.

It is an amenable number.

645629376 is an abundant number, since it is smaller than the sum of its proper divisors (1306634944).

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

645629376 is a wasteful number, since it uses less digits than its factorization.

645629376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480401 (or 480391 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 48.

The square root of 645629376 is about 25409.2380051036. The cubic root of 645629376 is about 864.2931961039.

The spelling of 645629376 in words is "six hundred forty-five million, six hundred twenty-nine thousand, three hundred seventy-six".