81395677 has 32 divisors (see below), whose sum is σ = 102297600. Its totient is φ = 63763200.

The previous prime is 81395653. The next prime is 81395683. The reversal of 81395677 is 77659318.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81395677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81395077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109774 + ... + 110512.

It is an arithmetic number, because the mean of its divisors is an integer number (3196800).

Almost surely, 2^81395677 is an apocalyptic number.

It is an amenable number.

81395677 is a deficient number, since it is larger than the sum of its proper divisors (20901923).

81395677 is a wasteful number, since it uses less digits than its factorization.

81395677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817.

The product of its digits is 317520, while the sum is 46.

The square root of 81395677 is about 9021.9552758812. The cubic root of 81395677 is about 433.3782516882.

The spelling of 81395677 in words is "eighty-one million, three hundred ninety-five thousand, six hundred seventy-seven".