645412424 has 16 divisors (see below), whose sum is σ = 1216911600. Its totient is φ = 320902672.

The previous prime is 645412409. The next prime is 645412451. The reversal of 645412424 is 424214546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223922 + ... + 226785.

It is an arithmetic number, because the mean of its divisors is an integer number (76056975).

Almost surely, 2^645412424 is an apocalyptic number.

It is an amenable number.

645412424 is a deficient number, since it is larger than the sum of its proper divisors (571499176).

645412424 is a wasteful number, since it uses less digits than its factorization.

645412424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450892 (or 450888 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 645412424 is about 25404.9684904351. The cubic root of 645412424 is about 864.1963752592.

The spelling of 645412424 in words is "six hundred forty-five million, four hundred twelve thousand, four hundred twenty-four".