645207424 has 16 divisors (see below), whose sum is σ = 1285374420. Its totient is φ = 322603648.

The previous prime is 645207413. The next prime is 645207449. The reversal of 645207424 is 424702546.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 645207424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2520214 + ... + 2520469.

Almost surely, 2^645207424 is an apocalyptic number.

645207424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

645207424 is a deficient number, since it is larger than the sum of its proper divisors (640166996).

645207424 is an equidigital number, since it uses as much as digits as its factorization.

645207424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5040697 (or 5040685 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 645207424 is about 25400.9335261521. The cubic root of 645207424 is about 864.1048683867.

The spelling of 645207424 in words is "six hundred forty-five million, two hundred seven thousand, four hundred twenty-four".