81676657 has 8 divisors (see below), whose sum is σ = 86837184. Its totient is φ = 76650288.

The previous prime is 81676627. The next prime is 81676667. The reversal of 81676657 is 75667618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81676657 - 2¹¹ = 81674609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81676627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32283 + ... + 34720.

It is an arithmetic number, because the mean of its divisors is an integer number (10854648).

Almost surely, 2^81676657 is an apocalyptic number.

It is an amenable number.

81676657 is a deficient number, since it is larger than the sum of its proper divisors (5160527).

81676657 is a wasteful number, since it uses less digits than its factorization.

81676657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67079.

The product of its digits is 423360, while the sum is 46.

The square root of 81676657 is about 9037.5138727418. The cubic root of 81676657 is about 433.8763566462.

The spelling of 81676657 in words is "eighty-one million, six hundred seventy-six thousand, six hundred fifty-seven".