646044764 has 24 divisors (see below), whose sum is σ = 1190913360. Its totient is φ = 305807616.

The previous prime is 646044757. The next prime is 646044767. The reversal of 646044764 is 467440646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646044767) 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, 181934 + ... + 185450.

It is an arithmetic number, because the mean of its divisors is an integer number (49621390).

Almost surely, 2^646044764 is an apocalyptic number.

It is an amenable number.

646044764 is a deficient number, since it is larger than the sum of its proper divisors (544868596).

646044764 is a wasteful number, since it uses less digits than its factorization.

646044764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5957 (or 5955 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 41.

The square root of 646044764 is about 25417.4106470348. The cubic root of 646044764 is about 864.4785140110.

The spelling of 646044764 in words is "six hundred forty-six million, forty-four thousand, seven hundred sixty-four".