81737934 has 16 divisors (see below), whose sum is σ = 163758672. Its totient is φ = 27198848.

The previous prime is 81737911. The next prime is 81737941. The reversal of 81737934 is 43973718.

It is a Curzon number.

It is a congruent number.

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, 7929 + ... + 15044.

It is an arithmetic number, because the mean of its divisors is an integer number (10234917).

Almost surely, 2^81737934 is an apocalyptic number.

81737934 is an abundant number, since it is smaller than the sum of its proper divisors (82020738).

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

81737934 is a wasteful number, since it uses less digits than its factorization.

81737934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23571.

The product of its digits is 127008, while the sum is 42.

The square root of 81737934 is about 9040.9033840651. The cubic root of 81737934 is about 433.9848331537.

The spelling of 81737934 in words is "eighty-one million, seven hundred thirty-seven thousand, nine hundred thirty-four".