647402865 has 32 divisors (see below), whose sum is σ = 1095275520. Its totient is φ = 325635264.

The previous prime is 647402851. The next prime is 647402869. The reversal of 647402865 is 568204746.

647402865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647402865 - 2¹⁶ = 647337329 is a prime.

It is a super-3 number, since 3×647402865³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (647402869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59692 + ... + 69698.

It is an arithmetic number, because the mean of its divisors is an integer number (34227360).

Almost surely, 2^647402865 is an apocalyptic number.

It is an amenable number.

647402865 is a deficient number, since it is larger than the sum of its proper divisors (447872655).

647402865 is a wasteful number, since it uses less digits than its factorization.

647402865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10261.

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 647402865 is about 25444.1125803200. The cubic root of 647402865 is about 865.0838525636.

The spelling of 647402865 in words is "six hundred forty-seven million, four hundred two thousand, eight hundred sixty-five".