81680134 has 16 divisors (see below), whose sum is σ = 126891072. Its totient is φ = 39406248.

The previous prime is 81680119. The next prime is 81680191. The reversal of 81680134 is 43108618.

It is a junction number, because it is equal to n+sod(n) for n = 81680096 and 81680105.

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, 1417 + ... + 12859.

It is an arithmetic number, because the mean of its divisors is an integer number (7930692).

Almost surely, 2^81680134 is an apocalyptic number.

81680134 is a deficient number, since it is larger than the sum of its proper divisors (45210938).

81680134 is a wasteful number, since it uses less digits than its factorization.

81680134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11571.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 81680134 is about 9037.7062355445. The cubic root of 81680134 is about 433.8825133081.

The spelling of 81680134 in words is "eighty-one million, six hundred eighty thousand, one hundred thirty-four".