642686710 has 32 divisors (see below), whose sum is σ = 1165806432. Its totient is φ = 255091200.

The previous prime is 642686687. The next prime is 642686743. The reversal of 642686710 is 17686246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1174657 + ... + 1175203.

It is an arithmetic number, because the mean of its divisors is an integer number (36431451).

Almost surely, 2^642686710 is an apocalyptic number.

642686710 is a deficient number, since it is larger than the sum of its proper divisors (523119722).

642686710 is a wasteful number, since it uses less digits than its factorization.

642686710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 642686710 is about 25351.2664377936. The cubic root of 642686710 is about 862.9780969034.

The spelling of 642686710 in words is "six hundred forty-two million, six hundred eighty-six thousand, seven hundred ten".