81694016 has 28 divisors (see below), whose sum is σ = 162458400. Its totient is φ = 40759680.

The previous prime is 81694013. The next prime is 81694031. The reversal of 81694016 is 61049618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81694013) 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, 37271 + ... + 39401.

Almost surely, 2^81694016 is an apocalyptic number.

It is an amenable number.

81694016 is a deficient number, since it is larger than the sum of its proper divisors (80764384).

81694016 is a wasteful number, since it uses less digits than its factorization.

81694016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742 (or 2732 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 81694016 is about 9038.4742075198. The cubic root of 81694016 is about 433.9070921767.

The spelling of 81694016 in words is "eighty-one million, six hundred ninety-four thousand, sixteen".