81230816 has 24 divisors (see below), whose sum is σ = 162180144. Its totient is φ = 40042240.

The previous prime is 81230813. The next prime is 81230837. The reversal of 81230816 is 61803218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81230813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15605 + ... + 20148.

It is an arithmetic number, because the mean of its divisors is an integer number (6757506).

Almost surely, 2^81230816 is an apocalyptic number.

It is an amenable number.

81230816 is a deficient number, since it is larger than the sum of its proper divisors (80949328).

81230816 is a wasteful number, since it uses less digits than its factorization.

81230816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35834 (or 35826 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 81230816 is about 9012.8139889826. The cubic root of 81230816 is about 433.0854619237.

The spelling of 81230816 in words is "eighty-one million, two hundred thirty thousand, eight hundred sixteen".