642658715 has 8 divisors (see below), whose sum is σ = 778678368. Its totient is φ = 509135040.

The previous prime is 642658699. The next prime is 642658727. The reversal of 642658715 is 517856246.

642658715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642658715 - 2⁴ = 642658699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623426 + ... + 624455.

It is an arithmetic number, because the mean of its divisors is an integer number (97334796).

Almost surely, 2^642658715 is an apocalyptic number.

642658715 is a deficient number, since it is larger than the sum of its proper divisors (136019653).

642658715 is a wasteful number, since it uses less digits than its factorization.

642658715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247989.

The product of its digits is 403200, while the sum is 44.

The square root of 642658715 is about 25350.7142897395. The cubic root of 642658715 is about 862.9655664733.

The spelling of 642658715 in words is "six hundred forty-two million, six hundred fifty-eight thousand, seven hundred fifteen".