408891402864 has 80 divisors (see below), whose sum is σ = 1341336887040. Its totient is φ = 116826114240.

The previous prime is 408891402841. The next prime is 408891402883. The reversal of 408891402864 is 468204198804.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 408891402864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67604682 + ... + 67610729.

It is an arithmetic number, because the mean of its divisors is an integer number (16766711088).

Almost surely, 2^408891402864 is an apocalyptic number.

It is an amenable number.

408891402864 is an abundant number, since it is smaller than the sum of its proper divisors (932445484176).

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

408891402864 is a wasteful number, since it uses less digits than its factorization.

408891402864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135215435 (or 135215423 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 408891402864 in words is "four hundred eight billion, eight hundred ninety-one million, four hundred two thousand, eight hundred sixty-four".