644374682 has 16 divisors (see below), whose sum is σ = 1111961472. Its totient is φ = 274330800.

The previous prime is 644374673. The next prime is 644374691. The reversal of 644374682 is 286473446.

It is an interprime number because it is at equal distance from previous prime (644374673) and next prime (644374691).

It is a super-2 number, since 2×644374682² = 830437461605202248, which contains 22 as substring.

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, 150293 + ... + 154520.

It is an arithmetic number, because the mean of its divisors is an integer number (69497592).

Almost surely, 2^644374682 is an apocalyptic number.

644374682 is a deficient number, since it is larger than the sum of its proper divisors (467586790).

644374682 is a wasteful number, since it uses less digits than its factorization.

644374682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304973.

The product of its digits is 774144, while the sum is 44.

The square root of 644374682 is about 25384.5362770329. The cubic root of 644374682 is about 863.7329537707.

The spelling of 644374682 in words is "six hundred forty-four million, three hundred seventy-four thousand, six hundred eighty-two".