646572464 has 10 divisors (see below), whose sum is σ = 1252734180. Its totient is φ = 323286224.

The previous prime is 646572463. The next prime is 646572469. The reversal of 646572464 is 464275646.

It is not an unprimeable number, because it can be changed into a prime (646572463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20205374 + ... + 20205405.

It is an arithmetic number, because the mean of its divisors is an integer number (125273418).

Almost surely, 2^646572464 is an apocalyptic number.

It is an amenable number.

646572464 is a deficient number, since it is larger than the sum of its proper divisors (606161716).

646572464 is a wasteful number, since it uses less digits than its factorization.

646572464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40410787 (or 40410781 counting only the distinct ones).

The product of its digits is 967680, while the sum is 44.

The square root of 646572464 is about 25427.7892078726. The cubic root of 646572464 is about 864.7138233823.

The spelling of 646572464 in words is "six hundred forty-six million, five hundred seventy-two thousand, four hundred sixty-four".