811797872 has 40 divisors (see below), whose sum is σ = 1681004016. Its totient is φ = 378438656.

The previous prime is 811797869. The next prime is 811797911. The reversal of 811797872 is 278797118.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 811797872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15158 + ... + 43050.

Almost surely, 2^811797872 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 811797872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840502008).

811797872 is an abundant number, since it is smaller than the sum of its proper divisors (869206144).

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

811797872 is a wasteful number, since it uses less digits than its factorization.

811797872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28025 (or 28019 counting only the distinct ones).

The product of its digits is 395136, while the sum is 50.

The square root of 811797872 is about 28492.0668256973. The cubic root of 811797872 is about 932.8589219371.

The spelling of 811797872 in words is "eight hundred eleven million, seven hundred ninety-seven thousand, eight hundred seventy-two".