81687334 has 8 divisors (see below), whose sum is σ = 125519688. Its totient is φ = 39847440.

The previous prime is 81687323. The next prime is 81687337. The reversal of 81687334 is 43378618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81687337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498012 + ... + 498175.

It is an arithmetic number, because the mean of its divisors is an integer number (15689961).

Almost surely, 2^81687334 is an apocalyptic number.

81687334 is a deficient number, since it is larger than the sum of its proper divisors (43832354).

81687334 is a wasteful number, since it uses less digits than its factorization.

81687334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996230.

The product of its digits is 96768, while the sum is 40.

The square root of 81687334 is about 9038.1045579258. The cubic root of 81687334 is about 433.8952616642.

The spelling of 81687334 in words is "eighty-one million, six hundred eighty-seven thousand, three hundred thirty-four".