81507934 has 8 divisors (see below), whose sum is σ = 123809760. Its totient is φ = 40238016.

The previous prime is 81507901. The next prime is 81507941. The reversal of 81507934 is 43970518.

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

It is a junction number, because it is equal to n+sod(n) for n = 81507893 and 81507902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257779 + ... + 258094.

It is an arithmetic number, because the mean of its divisors is an integer number (15476220).

Almost surely, 2^81507934 is an apocalyptic number.

81507934 is a deficient number, since it is larger than the sum of its proper divisors (42301826).

81507934 is a wasteful number, since it uses less digits than its factorization.

81507934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515954.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81507934 is about 9028.1744555586. The cubic root of 81507934 is about 433.5773916433.

The spelling of 81507934 in words is "eighty-one million, five hundred seven thousand, nine hundred thirty-four".