818722404 has 42 divisors (see below), whose sum is σ = 2148171270. Its totient is φ = 272906496.

The previous prime is 818722393. The next prime is 818722427. The reversal of 818722404 is 404227818.

It can be written as a sum of positive squares in only one way, i.e., 617025600 + 201696804 = 24840^2 + 14202^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 137469 + ... + 143300.

It is an arithmetic number, because the mean of its divisors is an integer number (51146935).

Almost surely, 2^818722404 is an apocalyptic number.

It is an amenable number.

818722404 is an abundant number, since it is smaller than the sum of its proper divisors (1329448866).

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

818722404 is a wasteful number, since it uses less digits than its factorization.

818722404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280791 (or 280774 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 818722404 is about 28613.3256368427. The cubic root of 818722404 is about 935.5038050496.

The spelling of 818722404 in words is "eight hundred eighteen million, seven hundred twenty-two thousand, four hundred four".