646460015 has 4 divisors (see below), whose sum is σ = 775752024. Its totient is φ = 517168008.

The previous prime is 646459973. The next prime is 646460051. The reversal of 646460015 is 510064646.

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 646460015 - 2⁶ = 646459951 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, 64645997 + ... + 64646006.

It is an arithmetic number, because the mean of its divisors is an integer number (193938006).

Almost surely, 2^646460015 is an apocalyptic number.

646460015 is a deficient number, since it is larger than the sum of its proper divisors (129292009).

646460015 is a wasteful number, since it uses less digits than its factorization.

646460015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129292008.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 646460015 is about 25425.5779678654. The cubic root of 646460015 is about 864.6636914184.

The spelling of 646460015 in words is "six hundred forty-six million, four hundred sixty thousand, fifteen".