815828380 has 24 divisors (see below), whose sum is σ = 1720358640. Its totient is φ = 324975360.

The previous prime is 815828369. The next prime is 815828389. The reversal of 815828380 is 83828518.

It is a super-2 number, since 2×815828380² = 1331151891226848800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815828389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79810 + ... + 89449.

It is an arithmetic number, because the mean of its divisors is an integer number (71681610).

Almost surely, 2^815828380 is an apocalyptic number.

It is an amenable number.

815828380 is an abundant number, since it is smaller than the sum of its proper divisors (904530260).

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

815828380 is a wasteful number, since it uses less digits than its factorization.

815828380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169509 (or 169507 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The square root of 815828380 is about 28562.7096053578. The cubic root of 815828380 is about 934.4002292267.

The spelling of 815828380 in words is "eight hundred fifteen million, eight hundred twenty-eight thousand, three hundred eighty".