81675906 has 16 divisors (see below), whose sum is σ = 175917504. Its totient is φ = 25131024.

The previous prime is 81675833. The next prime is 81675929. The reversal of 81675906 is 60957618.

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, 523486 + ... + 523641.

It is an arithmetic number, because the mean of its divisors is an integer number (10994844).

Almost surely, 2^81675906 is an apocalyptic number.

81675906 is an abundant number, since it is smaller than the sum of its proper divisors (94241598).

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

81675906 is a wasteful number, since it uses less digits than its factorization.

81675906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047145.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 81675906 is about 9037.4723236091. The cubic root of 81675906 is about 433.8750268409.

The spelling of 81675906 in words is "eighty-one million, six hundred seventy-five thousand, nine hundred six".