647215959 has 16 divisors (see below), whose sum is σ = 984003552. Its totient is φ = 374857728.

The previous prime is 647215931. The next prime is 647215967. The reversal of 647215959 is 959512746.

It is not a de Polignac number, because 647215959 - 2⁵ = 647215927 is a prime.

It is a super-3 number, since 3×647215959³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647215909) 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, 487434 + ... + 488759.

It is an arithmetic number, because the mean of its divisors is an integer number (61500222).

Almost surely, 2^647215959 is an apocalyptic number.

647215959 is a deficient number, since it is larger than the sum of its proper divisors (336787593).

647215959 is a wasteful number, since it uses less digits than its factorization.

647215959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976226.

The product of its digits is 680400, while the sum is 48.

The square root of 647215959 is about 25440.4394419593. The cubic root of 647215959 is about 865.0005942950. Note that the first 3 decimals are identical.

The spelling of 647215959 in words is "six hundred forty-seven million, two hundred fifteen thousand, nine hundred fifty-nine".