81228677 has 4 divisors (see below), whose sum is σ = 83117760. Its totient is φ = 79339596.

The previous prime is 81228659. The next prime is 81228713. The reversal of 81228677 is 77682218.

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 81228677 - 2⁶ = 81228613 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 (81228977) 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, 944477 + ... + 944562.

It is an arithmetic number, because the mean of its divisors is an integer number (20779440).

Almost surely, 2^81228677 is an apocalyptic number.

It is an amenable number.

81228677 is a deficient number, since it is larger than the sum of its proper divisors (1889083).

81228677 is a wasteful number, since it uses less digits than its factorization.

81228677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889082.

The product of its digits is 75264, while the sum is 41.

The square root of 81228677 is about 9012.6953238196. The cubic root of 81228677 is about 433.0816605012.

The spelling of 81228677 in words is "eighty-one million, two hundred twenty-eight thousand, six hundred seventy-seven".