868644590 has 16 divisors (see below), whose sum is σ = 1705702320. Its totient is φ = 315870720.

The previous prime is 868644587. The next prime is 868644607. The reversal of 868644590 is 95446868.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3948275 + ... + 3948494.

It is an arithmetic number, because the mean of its divisors is an integer number (106606395).

Almost surely, 2^868644590 is an apocalyptic number.

868644590 is a deficient number, since it is larger than the sum of its proper divisors (837057730).

868644590 is a wasteful number, since it uses less digits than its factorization.

868644590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7896787.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 868644590 is about 29472.7771002327. Note that the first 3 decimals coincide. The cubic root of 868644590 is about 954.1442550328.

The spelling of 868644590 in words is "eight hundred sixty-eight million, six hundred forty-four thousand, five hundred ninety".