81244692 has 36 divisors (see below), whose sum is σ = 205645440. Its totient is φ = 27045072.

The previous prime is 81244679. The next prime is 81244697. The reversal of 81244692 is 29644218.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81244697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45309 + ... + 47067.

Almost surely, 2^81244692 is an apocalyptic number.

It is an amenable number.

81244692 is an abundant number, since it is smaller than the sum of its proper divisors (124400748).

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

81244692 is a wasteful number, since it uses less digits than its factorization.

81244692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052 (or 3047 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 81244692 is about 9013.5837489869. The cubic root of 81244692 is about 433.1101206760.

The spelling of 81244692 in words is "eighty-one million, two hundred forty-four thousand, six hundred ninety-two".