81677912 has 8 divisors (see below), whose sum is σ = 153146100. Its totient is φ = 40838952.

The previous prime is 81677909. The next prime is 81677933. The reversal of 81677912 is 21977618.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 81677912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5104862 + ... + 5104877.

Almost surely, 2^81677912 is an apocalyptic number.

It is an amenable number.

81677912 is a deficient number, since it is larger than the sum of its proper divisors (71468188).

81677912 is a wasteful number, since it uses less digits than its factorization.

81677912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209745 (or 10209741 counting only the distinct ones).

The product of its digits is 42336, while the sum is 41.

The square root of 81677912 is about 9037.5833052869. The cubic root of 81677912 is about 433.8785788724.

The spelling of 81677912 in words is "eighty-one million, six hundred seventy-seven thousand, nine hundred twelve".