405615878016 has 64 divisors (see below), whose sum is σ = 1077495294720. Its totient is φ = 135195489792.

The previous prime is 405615877981. The next prime is 405615878141. The reversal of 405615878016 is 610878516504.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 405615878016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6899241 + ... + 6957783.

It is an arithmetic number, because the mean of its divisors is an integer number (16835863980).

Almost surely, 2^405615878016 is an apocalyptic number.

It is an amenable number.

405615878016 is an abundant number, since it is smaller than the sum of its proper divisors (671879416704).

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

405615878016 is a wasteful number, since it uses less digits than its factorization.

405615878016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76603 (or 76591 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 405615878016 in words is "four hundred five billion, six hundred fifteen million, eight hundred seventy-eight thousand, sixteen".