813606156 has 72 divisors (see below), whose sum is σ = 2258802000. Its totient is φ = 244874880.

The previous prime is 813606151. The next prime is 813606161. The reversal of 813606156 is 651606318.

It is a happy number.

813606156 is a `hidden beast` number, since 8 + 1 + 36 + 0 + 615 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (813606151) and next prime (813606161).

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

It is a self number, because there is not a number n which added to its sum of digits gives 813606156.

It is not an unprimeable number, because it can be changed into a prime (813606151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52110 + ... + 65898.

It is an arithmetic number, because the mean of its divisors is an integer number (31372250).

Almost surely, 2^813606156 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 813606156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129401000).

813606156 is an abundant number, since it is smaller than the sum of its proper divisors (1445195844).

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

813606156 is a wasteful number, since it uses less digits than its factorization.

813606156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13959 (or 13954 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 813606156 is about 28523.7822877682. The cubic root of 813606156 is about 933.5510576529.

The spelling of 813606156 in words is "eight hundred thirteen million, six hundred six thousand, one hundred fifty-six".