647707859 has 4 divisors (see below), whose sum is σ = 659928816. Its totient is φ = 635486904.

The previous prime is 647707843. The next prime is 647707861. The reversal of 647707859 is 958707746.

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 647707859 - 2⁴ = 647707843 is a prime.

It is a super-2 number, since 2×647707859² = 839050941220727762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 12220903 = 647707859 / (6 + 4 + 7 + 7 + 0 + 7 + 8 + 5 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647707859.

It is not an unprimeable number, because it can be changed into a prime (647707889) 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 3 ways as a sum of consecutive naturals, for example, 6110399 + ... + 6110504.

It is an arithmetic number, because the mean of its divisors is an integer number (164982204).

Almost surely, 2^647707859 is an apocalyptic number.

647707859 is a deficient number, since it is larger than the sum of its proper divisors (12220957).

647707859 is a wasteful number, since it uses less digits than its factorization.

647707859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12220956.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The square root of 647707859 is about 25450.1052846545. The cubic root of 647707859 is about 865.2196793555.

The spelling of 647707859 in words is "six hundred forty-seven million, seven hundred seven thousand, eight hundred fifty-nine".