400400078580 has 48 divisors (see below), whose sum is σ = 1245689135040. Its totient is φ = 106773354144.

The previous prime is 400400078503. The next prime is 400400078581. The reversal of 400400078580 is 85870004004.

400400078580 is a `hidden beast` number, since 4 + 0 + 0 + 4 + 0 + 0 + 0 + 78 + 580 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400400078581) 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, 370740274 + ... + 370741353.

It is an arithmetic number, because the mean of its divisors is an integer number (25951856980).

Almost surely, 2^400400078580 is an apocalyptic number.

It is an amenable number.

400400078580 is an abundant number, since it is smaller than the sum of its proper divisors (845289056460).

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

400400078580 is a wasteful number, since it uses less digits than its factorization.

400400078580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741481645 (or 741481637 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The spelling of 400400078580 in words is "four hundred billion, four hundred million, seventy-eight thousand, five hundred eighty".