677881691 has 4 divisors (see below), whose sum is σ = 707354832. Its totient is φ = 648408552.

The previous prime is 677881657. The next prime is 677881693. The reversal of 677881691 is 196188776.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-677881691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (677881693) 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, 14736536 + ... + 14736581.

It is an arithmetic number, because the mean of its divisors is an integer number (176838708).

Almost surely, 2^677881691 is an apocalyptic number.

677881691 is a deficient number, since it is larger than the sum of its proper divisors (29473141).

677881691 is a wasteful number, since it uses less digits than its factorization.

677881691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29473140.

The product of its digits is 1016064, while the sum is 53.

The square root of 677881691 is about 26036.1612185821. The cubic root of 677881691 is about 878.4518626659.

The spelling of 677881691 in words is "six hundred seventy-seven million, eight hundred eighty-one thousand, six hundred ninety-one".