404422678656 has 80 divisors (see below), whose sum is σ = 1203555369390. Its totient is φ = 134807556096.

The previous prime is 404422678643. The next prime is 404422678697. The reversal of 404422678656 is 656876224404.

It is a happy number.

404422678656 is a `hidden beast` number, since 404 + 4 + 226 + 7 + 8 + 6 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 375867086400 + 28555592256 = 613080^2 + 168984^2 .

It is a super-3 number, since 3×404422678656³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19493041 + ... + 19513776.

Almost surely, 2^404422678656 is an apocalyptic number.

It is an amenable number.

404422678656 is an abundant number, since it is smaller than the sum of its proper divisors (799132690734).

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

404422678656 is an equidigital number, since it uses as much as digits as its factorization.

404422678656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39006843 (or 39006822 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 54.

The spelling of 404422678656 in words is "four hundred four billion, four hundred twenty-two million, six hundred seventy-eight thousand, six hundred fifty-six".