81677212 has 12 divisors (see below), whose sum is σ = 142998856. Its totient is φ = 40820400.

The previous prime is 81677203. The next prime is 81677213. The reversal of 81677212 is 21277618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81677213) 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, 13462 + ... + 18562.

Almost surely, 2^81677212 is an apocalyptic number.

It is an amenable number.

81677212 is a deficient number, since it is larger than the sum of its proper divisors (61321644).

81677212 is a wasteful number, since it uses less digits than its factorization.

81677212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9108 (or 9106 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 81677212 is about 9037.5445780367. The cubic root of 81677212 is about 433.8773393865.

The spelling of 81677212 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred twelve".