664861244 has 12 divisors (see below), whose sum is σ = 1171317000. Its totient is φ = 330199248.

The previous prime is 664861231. The next prime is 664861283. The reversal of 664861244 is 442168466.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 557174 + ... + 558365.

It is an arithmetic number, because the mean of its divisors is an integer number (97609750).

Almost surely, 2^664861244 is an apocalyptic number.

It is an amenable number.

664861244 is a deficient number, since it is larger than the sum of its proper divisors (506455756).

664861244 is a wasteful number, since it uses less digits than its factorization.

664861244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115692 (or 1115690 counting only the distinct ones).

The product of its digits is 221184, while the sum is 41.

The square root of 664861244 is about 25784.9034126560. The cubic root of 664861244 is about 872.7911608072.

The spelling of 664861244 in words is "six hundred sixty-four million, eight hundred sixty-one thousand, two hundred forty-four".