642698684 has 12 divisors (see below), whose sum is σ = 1143161208. Its totient is φ = 316081200.

The previous prime is 642698677. The next prime is 642698699. The reversal of 642698684 is 486896246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1316762 + ... + 1317249.

It is an arithmetic number, because the mean of its divisors is an integer number (95263434).

Almost surely, 2^642698684 is an apocalyptic number.

It is an amenable number.

642698684 is a deficient number, since it is larger than the sum of its proper divisors (500462524).

642698684 is a wasteful number, since it uses less digits than its factorization.

642698684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634076 (or 2634074 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 53.

The square root of 642698684 is about 25351.5025984654. The cubic root of 642698684 is about 862.9834562983.

The spelling of 642698684 in words is "six hundred forty-two million, six hundred ninety-eight thousand, six hundred eighty-four".