677981 has 4 divisors (see below), whose sum is σ = 693792. Its totient is φ = 662172.

The previous prime is 677959. The next prime is 677983. The reversal of 677981 is 189776.

It is a happy number.

677981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-677981 is a prime.

It is a super-2 number, since 2×677981² = 919316472722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 677981.

It is not an unprimeable number, because it can be changed into a prime (677983) 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, 7841 + ... + 7926.

It is an arithmetic number, because the mean of its divisors is an integer number (173448).

2⁶⁷⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

677981 is a deficient number, since it is larger than the sum of its proper divisors (15811).

677981 is a wasteful number, since it uses less digits than its factorization.

677981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15810.

The product of its digits is 21168, while the sum is 38.

The square root of 677981 is about 823.3960165072. The cubic root of 677981 is about 87.8494758015.

The spelling of 677981 in words is "six hundred seventy-seven thousand, nine hundred eighty-one".