676606991 has 4 divisors (see below), whose sum is σ = 681087984. Its totient is φ = 672126000.

The previous prime is 676606981. The next prime is 676607011. The reversal of 676606991 is 199606676.

It is a happy number.

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-676606991 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 (676606921) 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, 2240270 + ... + 2240571.

It is an arithmetic number, because the mean of its divisors is an integer number (170271996).

Almost surely, 2^676606991 is an apocalyptic number.

676606991 is a deficient number, since it is larger than the sum of its proper divisors (4480993).

676606991 is a wasteful number, since it uses less digits than its factorization.

676606991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480992.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 676606991 is about 26011.6702847011. The cubic root of 676606991 is about 877.9008986792.

The spelling of 676606991 in words is "six hundred seventy-six million, six hundred six thousand, nine hundred ninety-one".