816540312 has 64 divisors (see below), whose sum is σ = 2380608000. Its totient is φ = 233294880.

The previous prime is 816540301. The next prime is 816540317. The reversal of 816540312 is 213045618.

It is a super-2 number, since 2×816540312² = 1333476162242114688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 816540312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816540317) 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, 41364 + ... + 57827.

It is an arithmetic number, because the mean of its divisors is an integer number (37197000).

Almost surely, 2^816540312 is an apocalyptic number.

It is an amenable number.

816540312 is an abundant number, since it is smaller than the sum of its proper divisors (1564067688).

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

816540312 is a wasteful number, since it uses less digits than its factorization.

816540312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99221 (or 99203 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 816540312 is about 28575.1695008096. The cubic root of 816540312 is about 934.6719514133.

The spelling of 816540312 in words is "eight hundred sixteen million, five hundred forty thousand, three hundred twelve".