647869290 has 64 divisors (see below), whose sum is σ = 1662135552. Its totient is φ = 161216000.

The previous prime is 647869289. The next prime is 647869333. The reversal of 647869290 is 92968746.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 16840 + ... + 39740.

It is an arithmetic number, because the mean of its divisors is an integer number (25970868).

Almost surely, 2^647869290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647869290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831067776).

647869290 is an abundant number, since it is smaller than the sum of its proper divisors (1014266262).

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

647869290 is a wasteful number, since it uses less digits than its factorization.

647869290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22975.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The square root of 647869290 is about 25453.2766063625. The cubic root of 647869290 is about 865.2915541850.

The spelling of 647869290 in words is "six hundred forty-seven million, eight hundred sixty-nine thousand, two hundred ninety".