647142875 has 16 divisors (see below), whose sum is σ = 812124768. Its totient is φ = 514836000.

The previous prime is 647142863. The next prime is 647142877. The reversal of 647142875 is 578241746.

It is not a de Polignac number, because 647142875 - 2²² = 642948571 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647142877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8324 + ... + 36926.

It is an arithmetic number, because the mean of its divisors is an integer number (50757798).

Almost surely, 2^647142875 is an apocalyptic number.

647142875 is a deficient number, since it is larger than the sum of its proper divisors (164981893).

647142875 is a wasteful number, since it uses less digits than its factorization.

647142875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28799 (or 28789 counting only the distinct ones).

The product of its digits is 376320, while the sum is 44.

The square root of 647142875 is about 25439.0030268484. The cubic root of 647142875 is about 864.9680342804.

The spelling of 647142875 in words is "six hundred forty-seven million, one hundred forty-two thousand, eight hundred seventy-five".