81208236 has 24 divisors (see below), whose sum is σ = 196020720. Its totient is φ = 26135872.

The previous prime is 81208217. The next prime is 81208247. The reversal of 81208236 is 63280218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116331 + ... + 117026.

It is an arithmetic number, because the mean of its divisors is an integer number (8167530).

Almost surely, 2^81208236 is an apocalyptic number.

It is an amenable number.

81208236 is an abundant number, since it is smaller than the sum of its proper divisors (114812484).

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

81208236 is a wasteful number, since it uses less digits than its factorization.

81208236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233393 (or 233391 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 81208236 is about 9011.5612409837. The cubic root of 81208236 is about 433.0453294696.

The spelling of 81208236 in words is "eighty-one million, two hundred eight thousand, two hundred thirty-six".