868256644 has 12 divisors (see below), whose sum is σ = 1529512768. Its totient is φ = 431253000.

The previous prime is 868256639. The next prime is 868256651. The reversal of 868256644 is 446652868.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718152 + ... + 719359.

Almost surely, 2^868256644 is an apocalyptic number.

It is an amenable number.

868256644 is a deficient number, since it is larger than the sum of its proper divisors (661256124).

868256644 is a wasteful number, since it uses less digits than its factorization.

868256644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437666 (or 1437664 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 49.

The square root of 868256644 is about 29466.1949358922. The cubic root of 868256644 is about 954.0021901920.

The spelling of 868256644 in words is "eight hundred sixty-eight million, two hundred fifty-six thousand, six hundred forty-four".