647726423 has 4 divisors (see below), whose sum is σ = 648999480. Its totient is φ = 646453368.

The previous prime is 647726383. The next prime is 647726447. The reversal of 647726423 is 324627746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647726423 - 2²⁶ = 580617559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647326423) 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, 635765 + ... + 636782.

It is an arithmetic number, because the mean of its divisors is an integer number (162249870).

Almost surely, 2^647726423 is an apocalyptic number.

647726423 is a deficient number, since it is larger than the sum of its proper divisors (1273057).

647726423 is a wasteful number, since it uses less digits than its factorization.

647726423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273056.

The product of its digits is 338688, while the sum is 41.

The square root of 647726423 is about 25450.4699956602. The cubic root of 647726423 is about 865.2279453170.

The spelling of 647726423 in words is "six hundred forty-seven million, seven hundred twenty-six thousand, four hundred twenty-three".