647964527 has 4 divisors (see below), whose sum is σ = 740530896. Its totient is φ = 555398160.

The previous prime is 647964481. The next prime is 647964529. The reversal of 647964527 is 725469746.

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 647964527 - 2²² = 643770223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647964529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46283174 + ... + 46283187.

It is an arithmetic number, because the mean of its divisors is an integer number (185132724).

Almost surely, 2^647964527 is an apocalyptic number.

647964527 is a deficient number, since it is larger than the sum of its proper divisors (92566369).

647964527 is an equidigital number, since it uses as much as digits as its factorization.

647964527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92566368.

The product of its digits is 2540160, while the sum is 50.

The square root of 647964527 is about 25455.1473576564. The cubic root of 647964527 is about 865.3339514892. Note that the first 3 decimals are identical.

The spelling of 647964527 in words is "six hundred forty-seven million, nine hundred sixty-four thousand, five hundred twenty-seven".