642673684 has 12 divisors (see below), whose sum is σ = 1130332000. Its totient is φ = 319721688.

The previous prime is 642673649. The next prime is 642673687. The reversal of 642673684 is 486376246.

It is a super-2 number, since 2×642673684² = 826058928212263712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642673687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402894 + ... + 404485.

Almost surely, 2^642673684 is an apocalyptic number.

It is an amenable number.

642673684 is a deficient number, since it is larger than the sum of its proper divisors (487658316).

642673684 is a wasteful number, since it uses less digits than its factorization.

642673684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807582 (or 807580 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 46.

The square root of 642673684 is about 25351.0095262496. The cubic root of 642673684 is about 862.9722665725.

The spelling of 642673684 in words is "six hundred forty-two million, six hundred seventy-three thousand, six hundred eighty-four".