647452957 has 4 divisors (see below), whose sum is σ = 647648956. Its totient is φ = 647256960.

The previous prime is 647452913. The next prime is 647452979. The reversal of 647452957 is 759254746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 759254746 = 2 ⋅379627373.

It can be written as a sum of positive squares in 2 ways, for example, as 428738436 + 218714521 = 20706^2 + 14789^2 .

It is a cyclic number.

It is not a de Polignac number, because 647452957 - 2¹⁹ = 646928669 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 647452957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647452907) 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, 92958 + ... + 99679.

It is an arithmetic number, because the mean of its divisors is an integer number (161912239).

Almost surely, 2^647452957 is an apocalyptic number.

It is an amenable number.

647452957 is a deficient number, since it is larger than the sum of its proper divisors (195999).

647452957 is a wasteful number, since it uses less digits than its factorization.

647452957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195998.

The product of its digits is 2116800, while the sum is 49.

The square root of 647452957 is about 25445.0969147300. The cubic root of 647452957 is about 865.1061635877.

The spelling of 647452957 in words is "six hundred forty-seven million, four hundred fifty-two thousand, nine hundred fifty-seven".