646976572 has 48 divisors (see below), whose sum is σ = 1279724544. Its totient is φ = 283536000.

The previous prime is 646976569. The next prime is 646976579. The reversal of 646976572 is 275679646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646976579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450768 + ... + 452200.

It is an arithmetic number, because the mean of its divisors is an integer number (26660928).

Almost surely, 2^646976572 is an apocalyptic number.

646976572 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

646976572 is a deficient number, since it is larger than the sum of its proper divisors (632747972).

646976572 is a wasteful number, since it uses less digits than its factorization.

646976572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810 (or 1808 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 52.

The square root of 646976572 is about 25435.7341549246. The cubic root of 646976572 is about 864.8939346711.

The spelling of 646976572 in words is "six hundred forty-six million, nine hundred seventy-six thousand, five hundred seventy-two".