866818944 has 48 divisors (see below), whose sum is σ = 2494365120. Its totient is φ = 288939264.

The previous prime is 866818921. The next prime is 866818951. The reversal of 866818944 is 449818668.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 375072 + ... + 377375.

It is an arithmetic number, because the mean of its divisors is an integer number (51965940).

Almost surely, 2^866818944 is an apocalyptic number.

It is an amenable number.

866818944 is an abundant number, since it is smaller than the sum of its proper divisors (1627546176).

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

866818944 is a wasteful number, since it uses less digits than its factorization.

866818944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752467 (or 752452 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 866818944 is about 29441.7890760735. The cubic root of 866818944 is about 953.4753387932.

The spelling of 866818944 in words is "eight hundred sixty-six million, eight hundred eighteen thousand, nine hundred forty-four".