81342936 has 24 divisors (see below), whose sum is σ = 220303980. Its totient is φ = 27114288.

The previous prime is 81342931. The next prime is 81342959. The reversal of 81342936 is 63924318.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 81342936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342931) 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 5 ways as a sum of consecutive naturals, for example, 564810 + ... + 564953.

Almost surely, 2^81342936 is an apocalyptic number.

It is an amenable number.

81342936 is an abundant number, since it is smaller than the sum of its proper divisors (138961044).

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

81342936 is a wasteful number, since it uses less digits than its factorization.

81342936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129775 (or 1129768 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 81342936 is about 9019.0318770919. The cubic root of 81342936 is about 433.2846277934.

The spelling of 81342936 in words is "eighty-one million, three hundred forty-two thousand, nine hundred thirty-six".