815555104 has 96 divisors (see below), whose sum is σ = 1986405120. Its totient is φ = 320965632.

The previous prime is 815555101. The next prime is 815555179. The reversal of 815555104 is 401555518.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 815555104.

It is not an unprimeable number, because it can be changed into a prime (815555101) 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, 666237 + ... + 667459.

It is an arithmetic number, because the mean of its divisors is an integer number (20691720).

Almost surely, 2^815555104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815555104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993202560).

815555104 is an abundant number, since it is smaller than the sum of its proper divisors (1170850016).

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

815555104 is a wasteful number, since it uses less digits than its factorization.

815555104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 34.

The square root of 815555104 is about 28557.9254148476. The cubic root of 815555104 is about 934.2958863364.

The spelling of 815555104 in words is "eight hundred fifteen million, five hundred fifty-five thousand, one hundred four".