81360906 has 32 divisors (see below), whose sum is σ = 178027200. Its totient is φ = 24583680.

The previous prime is 81360893. The next prime is 81360911. The reversal of 81360906 is 60906318.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24090 + ... + 27258.

It is an arithmetic number, because the mean of its divisors is an integer number (5563350).

Almost surely, 2^81360906 is an apocalyptic number.

81360906 is an abundant number, since it is smaller than the sum of its proper divisors (96666294).

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

81360906 is a wasteful number, since it uses less digits than its factorization.

81360906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 81360906 is about 9020.0280487369. The cubic root of 81360906 is about 433.3165320245.

The spelling of 81360906 in words is "eighty-one million, three hundred sixty thousand, nine hundred six".