646937976 has 16 divisors (see below), whose sum is σ = 1617345000. Its totient is φ = 215645984.

The previous prime is 646937971. The next prime is 646937987. The reversal of 646937976 is 679739646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646937971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13477851 + ... + 13477898.

Almost surely, 2^646937976 is an apocalyptic number.

It is an amenable number.

646937976 is an abundant number, since it is smaller than the sum of its proper divisors (970407024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646937976 is a wasteful number, since it uses less digits than its factorization.

646937976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26955758 (or 26955754 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 57.

The square root of 646937976 is about 25434.9754472065. The cubic root of 646937976 is about 864.8767356402.

The spelling of 646937976 in words is "six hundred forty-six million, nine hundred thirty-seven thousand, nine hundred seventy-six".