815340820 has 48 divisors (see below), whose sum is σ = 1960197120. Its totient is φ = 279062784.

The previous prime is 815340809. The next prime is 815340821. The reversal of 815340820 is 28043518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815340821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81661 + ... + 91099.

It is an arithmetic number, because the mean of its divisors is an integer number (40837440).

Almost surely, 2^815340820 is an apocalyptic number.

It is an amenable number.

815340820 is an abundant number, since it is smaller than the sum of its proper divisors (1144856300).

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

815340820 is a wasteful number, since it uses less digits than its factorization.

815340820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10072 (or 10070 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 815340820 is about 28554.1734252631. The cubic root of 815340820 is about 934.2140516058.

The spelling of 815340820 in words is "eight hundred fifteen million, three hundred forty thousand, eight hundred twenty".