642715 has 8 divisors (see below), whose sum is σ = 776448. Its totient is φ = 510720.

The previous prime is 642701. The next prime is 642737. The reversal of 642715 is 517246.

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

It is not a de Polignac number, because 642715 - 2⁵ = 642683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642715.

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, 619 + ... + 1291.

It is an arithmetic number, because the mean of its divisors is an integer number (97056).

2⁶⁴²⁷¹⁵ is an apocalyptic number.

642715 is a deficient number, since it is larger than the sum of its proper divisors (133733).

642715 is a wasteful number, since it uses less digits than its factorization.

642715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869.

The product of its digits is 1680, while the sum is 25.

The square root of 642715 is about 801.6950791916. The cubic root of 642715 is about 86.2990759004.

The spelling of 642715 in words is "six hundred forty-two thousand, seven hundred fifteen".