647653969 has 4 divisors (see below), whose sum is σ = 681741040. Its totient is φ = 613566900.

The previous prime is 647653967. The next prime is 647653973. The reversal of 647653969 is 969356746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647653969 - 2¹ = 647653967 is a prime.

It is a super-2 number, since 2×647653969² = 838911327122905922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647653961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17043507 + ... + 17043544.

It is an arithmetic number, because the mean of its divisors is an integer number (170435260).

Almost surely, 2^647653969 is an apocalyptic number.

It is an amenable number.

647653969 is a deficient number, since it is larger than the sum of its proper divisors (34087071).

647653969 is a wasteful number, since it uses less digits than its factorization.

647653969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34087070.

The product of its digits is 7348320, while the sum is 55.

The square root of 647653969 is about 25449.0465243789. The cubic root of 647653969 is about 865.1956829498.

The spelling of 647653969 in words is "six hundred forty-seven million, six hundred fifty-three thousand, nine hundred sixty-nine".