676991 has 8 divisors (see below), whose sum is σ = 819360. Its totient is φ = 546048.

The previous prime is 676987. The next prime is 676993. The reversal of 676991 is 199676.

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 676991 - 2² = 676987 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 (676993) 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, 2726 + ... + 2963.

It is an arithmetic number, because the mean of its divisors is an integer number (102420).

2⁶⁷⁶⁹⁹¹ is an apocalyptic number.

676991 is a deficient number, since it is larger than the sum of its proper divisors (142369).

676991 is a wasteful number, since it uses less digits than its factorization.

676991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5713.

The product of its digits is 20412, while the sum is 38.

The square root of 676991 is about 822.7946280816. The cubic root of 676991 is about 87.8066951791.

The spelling of 676991 in words is "six hundred seventy-six thousand, nine hundred ninety-one".