815023836 has 96 divisors (see below), whose sum is σ = 2323157760. Its totient is φ = 245044800.

The previous prime is 815023813. The next prime is 815023841. The reversal of 815023836 is 638320518.

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 815023836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153010 + ... + 158246.

It is an arithmetic number, because the mean of its divisors is an integer number (24199560).

Almost surely, 2^815023836 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 815023836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161578880).

815023836 is an abundant number, since it is smaller than the sum of its proper divisors (1508133924).

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

815023836 is a wasteful number, since it uses less digits than its factorization.

815023836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5392 (or 5384 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 815023836 is about 28548.6223135198. The cubic root of 815023836 is about 934.0929696059.

The spelling of 815023836 in words is "eight hundred fifteen million, twenty-three thousand, eight hundred thirty-six".