81455694 has 8 divisors (see below), whose sum is σ = 162911400. Its totient is φ = 27151896.

The previous prime is 81455659. The next prime is 81455701. The reversal of 81455694 is 49655418.

It is a sphenic number, since it is the product of 3 distinct primes.

81455694 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6787969 + ... + 6787980.

It is an arithmetic number, because the mean of its divisors is an integer number (20363925).

Almost surely, 2^81455694 is an apocalyptic number.

81455694 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81455694 is a wasteful number, since it uses less digits than its factorization.

81455694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13575954.

The product of its digits is 172800, while the sum is 42.

The square root of 81455694 is about 9025.2808266558. The cubic root of 81455694 is about 433.4847424884.

The spelling of 81455694 in words is "eighty-one million, four hundred fifty-five thousand, six hundred ninety-four".