80400864 has 24 divisors (see below), whose sum is σ = 211052520. Its totient is φ = 26800256.

The previous prime is 80400863. The next prime is 80400869. The reversal of 80400864 is 46800408.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80400863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418659 + ... + 418850.

It is an arithmetic number, because the mean of its divisors is an integer number (8793855).

Almost surely, 2^80400864 is an apocalyptic number.

It is an amenable number.

80400864 is an abundant number, since it is smaller than the sum of its proper divisors (130651656).

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

80400864 is a wasteful number, since it uses less digits than its factorization.

80400864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837522 (or 837514 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 80400864 is about 8966.6528872261. The cubic root of 80400864 is about 431.6054353468.

The spelling of 80400864 in words is "eighty million, four hundred thousand, eight hundred sixty-four".