81677233 has 4 divisors (see below), whose sum is σ = 89102448. Its totient is φ = 74252020.

The previous prime is 81677227. The next prime is 81677237. The reversal of 81677233 is 33277618.

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 a de Polignac number, because none of the positive numbers 2^k-81677233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81677192 and 81677201.

It is not an unprimeable number, because it can be changed into a prime (81677237) 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, 3712591 + ... + 3712612.

It is an arithmetic number, because the mean of its divisors is an integer number (22275612).

Almost surely, 2^81677233 is an apocalyptic number.

It is an amenable number.

81677233 is a deficient number, since it is larger than the sum of its proper divisors (7425215).

81677233 is a wasteful number, since it uses less digits than its factorization.

81677233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7425214.

The product of its digits is 42336, while the sum is 37.

The square root of 81677233 is about 9037.5457398566. The cubic root of 81677233 is about 433.8773765712.

It can be divided in two parts, 8167 and 7233, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 81677233 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred thirty-three".