642952015 has 4 divisors (see below), whose sum is σ = 771542424. Its totient is φ = 514361608.

The previous prime is 642951989. The next prime is 642952027. The reversal of 642952015 is 510259246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642952015 - 2⁵ = 642951983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64295197 + ... + 64295206.

It is an arithmetic number, because the mean of its divisors is an integer number (192885606).

Almost surely, 2^642952015 is an apocalyptic number.

642952015 is a deficient number, since it is larger than the sum of its proper divisors (128590409).

642952015 is a wasteful number, since it uses less digits than its factorization.

642952015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128590408.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 642952015 is about 25356.4984767219. The cubic root of 642952015 is about 863.0968281107.

The spelling of 642952015 in words is "six hundred forty-two million, nine hundred fifty-two thousand, fifteen".