647765385 has 16 divisors (see below), whose sum is σ = 1090973760. Its totient is φ = 327291840.

The previous prime is 647765369. The next prime is 647765413. The reversal of 647765385 is 583567746.

It is not a de Polignac number, because 647765385 - 2⁴ = 647765369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1136146 + ... + 1136715.

It is an arithmetic number, because the mean of its divisors is an integer number (68185860).

Almost surely, 2^647765385 is an apocalyptic number.

It is an amenable number.

647765385 is a deficient number, since it is larger than the sum of its proper divisors (443208375).

647765385 is a wasteful number, since it uses less digits than its factorization.

647765385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272888.

The product of its digits is 4233600, while the sum is 51.

The square root of 647765385 is about 25451.2354317035. The cubic root of 647765385 is about 865.2452933485.

The spelling of 647765385 in words is "six hundred forty-seven million, seven hundred sixty-five thousand, three hundred eighty-five".