81634908 has 12 divisors (see below), whose sum is σ = 190481480. Its totient is φ = 27211632.

The previous prime is 81634907. The next prime is 81634921. The reversal of 81634908 is 80943618.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81634907) 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, 3401443 + ... + 3401466.

Almost surely, 2^81634908 is an apocalyptic number.

It is an amenable number.

81634908 is an abundant number, since it is smaller than the sum of its proper divisors (108846572).

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

81634908 is a wasteful number, since it uses less digits than its factorization.

81634908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6802916 (or 6802914 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 81634908 is about 9035.2038161848. The cubic root of 81634908 is about 433.8024187882.

The spelling of 81634908 in words is "eighty-one million, six hundred thirty-four thousand, nine hundred eight".