816533140 has 24 divisors (see below), whose sum is σ = 1724994432. Its totient is φ = 324656160.

The previous prime is 816533117. The next prime is 816533147. The reversal of 816533140 is 41335618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816533147) 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, 118896 + ... + 125575.

It is an arithmetic number, because the mean of its divisors is an integer number (71874768).

Almost surely, 2^816533140 is an apocalyptic number.

It is an amenable number.

816533140 is an abundant number, since it is smaller than the sum of its proper divisors (908461292).

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

816533140 is a wasteful number, since it uses less digits than its factorization.

816533140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244647 (or 244645 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 816533140 is about 28575.0440069652. The cubic root of 816533140 is about 934.6692148728.

Adding to 816533140 its reverse (41335618), we get a palindrome (857868758).

The spelling of 816533140 in words is "eight hundred sixteen million, five hundred thirty-three thousand, one hundred forty".