326640644 has 24 divisors (see below), whose sum is σ = 627334848. Its totient is φ = 147580640.

The previous prime is 326640619. The next prime is 326640649. The reversal of 326640644 is 446046623.

It is a super-2 number, since 2×326640644² = 213388220625469472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (326640649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14879 + ... + 29574.

It is an arithmetic number, because the mean of its divisors is an integer number (26138952).

Almost surely, 2^326640644 is an apocalyptic number.

It is an amenable number.

326640644 is a deficient number, since it is larger than the sum of its proper divisors (300694204).

326640644 is a wasteful number, since it uses less digits than its factorization.

326640644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44635 (or 44633 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 326640644 is about 18073.2023725736. The cubic root of 326640644 is about 688.6894145124.

The spelling of 326640644 in words is "three hundred twenty-six million, six hundred forty thousand, six hundred forty-four".