81447677 has 4 divisors (see below), whose sum is σ = 81947520. Its totient is φ = 80947836.

The previous prime is 81447659. The next prime is 81447701. The reversal of 81447677 is 77674418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81447677 - 2¹² = 81443581 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 (81447617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249677 + ... + 250002.

It is an arithmetic number, because the mean of its divisors is an integer number (20486880).

Almost surely, 2^81447677 is an apocalyptic number.

It is an amenable number.

81447677 is a deficient number, since it is larger than the sum of its proper divisors (499843).

81447677 is a wasteful number, since it uses less digits than its factorization.

81447677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499842.

The product of its digits is 263424, while the sum is 44.

The square root of 81447677 is about 9024.8366744224. The cubic root of 81447677 is about 433.4705206007.

The spelling of 81447677 in words is "eighty-one million, four hundred forty-seven thousand, six hundred seventy-seven".