642500915 has 8 divisors (see below), whose sum is σ = 881144160. Its totient is φ = 440572032.

The previous prime is 642500891. The next prime is 642500977. The reversal of 642500915 is 519005246.

It is a happy number.

642500915 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 a cyclic number.

It is not a de Polignac number, because 642500915 - 2⁸ = 642500659 is a prime.

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, 9178550 + ... + 9178619.

It is an arithmetic number, because the mean of its divisors is an integer number (110143020).

Almost surely, 2^642500915 is an apocalyptic number.

642500915 is a deficient number, since it is larger than the sum of its proper divisors (238643245).

642500915 is a wasteful number, since it uses less digits than its factorization.

642500915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18357181.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 642500915 is about 25347.6017603244. The cubic root of 642500915 is about 862.8949291297.

The spelling of 642500915 in words is "six hundred forty-two million, five hundred thousand, nine hundred fifteen".