81577676 has 12 divisors (see below), whose sum is σ = 142885008. Its totient is φ = 40753392.

The previous prime is 81577673. The next prime is 81577681. The reversal of 81577676 is 67677518.

It is a self number, because there is not a number n which added to its sum of digits gives 81577676.

It is not an unprimeable number, because it can be changed into a prime (81577673) 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, 3296 + ... + 13191.

It is an arithmetic number, because the mean of its divisors is an integer number (11907084).

Almost surely, 2^81577676 is an apocalyptic number.

It is an amenable number.

81577676 is a deficient number, since it is larger than the sum of its proper divisors (61307332).

81577676 is a wasteful number, since it uses less digits than its factorization.

81577676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17728 (or 17726 counting only the distinct ones).

The product of its digits is 493920, while the sum is 47.

The square root of 81577676 is about 9032.0360938163. The cubic root of 81577676 is about 433.7010194202.

The spelling of 81577676 in words is "eighty-one million, five hundred seventy-seven thousand, six hundred seventy-six".