866442864 has 80 divisors (see below), whose sum is σ = 2692724480. Its totient is φ = 234524160.

The previous prime is 866442809. The next prime is 866442869. The reversal of 866442864 is 468244668.

It is a Harshad number since it is a multiple of its sum of digits (48).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866442869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61477 + ... + 74244.

It is an arithmetic number, because the mean of its divisors is an integer number (33659056).

Almost surely, 2^866442864 is an apocalyptic number.

866442864 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

866442864 is an abundant number, since it is smaller than the sum of its proper divisors (1826281616).

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

866442864 is a wasteful number, since it uses less digits than its factorization.

866442864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135758 (or 135752 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 48.

The square root of 866442864 is about 29435.4015430400. The cubic root of 866442864 is about 953.3374265341.

The spelling of 866442864 in words is "eight hundred sixty-six million, four hundred forty-two thousand, eight hundred sixty-four".