647235813 has 16 divisors (see below), whose sum is σ = 993467520. Its totient is φ = 367147776.

The previous prime is 647235811. The next prime is 647235821. The reversal of 647235813 is 318532746.

It is not a de Polignac number, because 647235813 - 2¹ = 647235811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647235811) 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, 109608 + ... + 115361.

It is an arithmetic number, because the mean of its divisors is an integer number (62091720).

Almost surely, 2^647235813 is an apocalyptic number.

It is an amenable number.

647235813 is a deficient number, since it is larger than the sum of its proper divisors (346231707).

647235813 is a wasteful number, since it uses less digits than its factorization.

647235813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225116.

The product of its digits is 120960, while the sum is 39.

The square root of 647235813 is about 25440.8296444908. The cubic root of 647235813 is about 865.0094391254.

The spelling of 647235813 in words is "six hundred forty-seven million, two hundred thirty-five thousand, eight hundred thirteen".