81694028 has 24 divisors (see below), whose sum is σ = 155335488. Its totient is φ = 37368576.

The previous prime is 81694013. The next prime is 81694031. The reversal of 81694028 is 82049618.

It is a junction number, because it is equal to n+sod(n) for n = 81693982 and 81694000.

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, 1076 + ... + 12827.

It is an arithmetic number, because the mean of its divisors is an integer number (6472312).

Almost surely, 2^81694028 is an apocalyptic number.

It is an amenable number.

81694028 is a deficient number, since it is larger than the sum of its proper divisors (73641460).

81694028 is a wasteful number, since it uses less digits than its factorization.

81694028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14033 (or 14031 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 81694028 is about 9038.4748713486. The cubic root of 81694028 is about 433.9071134222.

The spelling of 81694028 in words is "eighty-one million, six hundred ninety-four thousand, twenty-eight".