644276482 has 16 divisors (see below), whose sum is σ = 990392832. Its totient is φ = 314168400.

The previous prime is 644276467. The next prime is 644276513. The reversal of 644276482 is 284672446.

It is a Harshad number since it is a multiple of its sum of digits (43).

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, 54943 + ... + 65629.

It is an arithmetic number, because the mean of its divisors is an integer number (61899552).

Almost surely, 2^644276482 is an apocalyptic number.

644276482 is a deficient number, since it is larger than the sum of its proper divisors (346116350).

644276482 is a wasteful number, since it uses less digits than its factorization.

644276482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11433.

The product of its digits is 516096, while the sum is 43.

The square root of 644276482 is about 25382.6019548824. The cubic root of 644276482 is about 863.6890751146.

The spelling of 644276482 in words is "six hundred forty-four million, two hundred seventy-six thousand, four hundred eighty-two".