647259653 has 4 divisors (see below), whose sum is σ = 647517120. Its totient is φ = 647002188.

The previous prime is 647259631. The next prime is 647259667. The reversal of 647259653 is 356952746.

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, and also an emirpimes, since its reverse is a distinct semiprime: 356952746 = 2 ⋅178476373.

It is a cyclic number.

It is not a de Polignac number, because 647259653 - 2⁸ = 647259397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647259598 and 647259607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647259623) 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, 124925 + ... + 130002.

It is an arithmetic number, because the mean of its divisors is an integer number (161879280).

Almost surely, 2^647259653 is an apocalyptic number.

It is an amenable number.

647259653 is a deficient number, since it is larger than the sum of its proper divisors (257467).

647259653 is a wasteful number, since it uses less digits than its factorization.

647259653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257466.

The product of its digits is 1360800, while the sum is 47.

The square root of 647259653 is about 25441.2981783556. The cubic root of 647259653 is about 865.0200594544.

The spelling of 647259653 in words is "six hundred forty-seven million, two hundred fifty-nine thousand, six hundred fifty-three".