647469823 has 16 divisors (see below), whose sum is σ = 869331456. Its totient is φ = 465711840.

The previous prime is 647469817. The next prime is 647469829. The reversal of 647469823 is 328964746.

It is an interprime number because it is at equal distance from previous prime (647469817) and next prime (647469829).

It is a de Polignac number, because none of the positive numbers 2^k-647469823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647469829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322411 + ... + 324412.

It is an arithmetic number, because the mean of its divisors is an integer number (54333216).

Almost surely, 2^647469823 is an apocalyptic number.

647469823 is a deficient number, since it is larger than the sum of its proper divisors (221861633).

647469823 is a wasteful number, since it uses less digits than its factorization.

647469823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646854.

The product of its digits is 1741824, while the sum is 49.

The square root of 647469823 is about 25445.4283320207. The cubic root of 647469823 is about 865.1136754611.

The spelling of 647469823 in words is "six hundred forty-seven million, four hundred sixty-nine thousand, eight hundred twenty-three".