815420872 has 32 divisors (see below), whose sum is σ = 1839297600. Its totient is φ = 331072704.

The previous prime is 815420839. The next prime is 815420923. The reversal of 815420872 is 278024518.

It is a super-2 number, since 2×815420872² = 1329822396986480768, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 382123 + ... + 384250.

It is an arithmetic number, because the mean of its divisors is an integer number (57478050).

Almost surely, 2^815420872 is an apocalyptic number.

It is an amenable number.

815420872 is an abundant number, since it is smaller than the sum of its proper divisors (1023876728).

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

815420872 is a wasteful number, since it uses less digits than its factorization.

815420872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766405 (or 766401 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 815420872 is about 28555.5751474209. The cubic root of 815420872 is about 934.2446250192.

The spelling of 815420872 in words is "eight hundred fifteen million, four hundred twenty thousand, eight hundred seventy-two".