647665530 has 32 divisors (see below), whose sum is σ = 1569794688. Its totient is φ = 171000000.

The previous prime is 647665519. The next prime is 647665537. The reversal of 647665530 is 35566746.

It is not an unprimeable number, because it can be changed into a prime (647665537) 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, 103846 + ... + 109905.

It is an arithmetic number, because the mean of its divisors is an integer number (49056084).

Almost surely, 2^647665530 is an apocalyptic number.

647665530 is an abundant number, since it is smaller than the sum of its proper divisors (922129158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647665530 is a wasteful number, since it uses less digits than its factorization.

647665530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213862.

The product of its (nonzero) digits is 453600, while the sum is 42.

The square root of 647665530 is about 25449.2736635056. The cubic root of 647665530 is about 865.2008310012.

The spelling of 647665530 in words is "six hundred forty-seven million, six hundred sixty-five thousand, five hundred thirty".