647764715 has 8 divisors (see below), whose sum is σ = 837111408. Its totient is φ = 478349280.

The previous prime is 647764681. The next prime is 647764721. The reversal of 647764715 is 517467746.

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

It is not a de Polignac number, because 647764715 - 2²⁶ = 580655851 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 647764715.

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, 4982741 + ... + 4982870.

It is an arithmetic number, because the mean of its divisors is an integer number (104638926).

Almost surely, 2^647764715 is an apocalyptic number.

647764715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

647764715 is a deficient number, since it is larger than the sum of its proper divisors (189346693).

647764715 is a wasteful number, since it uses less digits than its factorization.

647764715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9965629.

The product of its digits is 987840, while the sum is 47.

The square root of 647764715 is about 25451.2222692742. Note that the first 4 decimals coincide. The cubic root of 647764715 is about 865.2449950335.

The spelling of 647764715 in words is "six hundred forty-seven million, seven hundred sixty-four thousand, seven hundred fifteen".