677987 has 4 divisors (see below), whose sum is σ = 682080. Its totient is φ = 673896.

The previous prime is 677983. The next prime is 678023. The reversal of 677987 is 789776.

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

It is a cyclic number.

It is not a de Polignac number, because 677987 - 2² = 677983 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 677987.

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, 1787 + ... + 2132.

It is an arithmetic number, because the mean of its divisors is an integer number (170520).

2⁶⁷⁷⁹⁸⁷ is an apocalyptic number.

677987 is a deficient number, since it is larger than the sum of its proper divisors (4093).

677987 is a wasteful number, since it uses less digits than its factorization.

677987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092.

The product of its digits is 148176, while the sum is 44.

The square root of 677987 is about 823.3996599465. The cubic root of 677987 is about 87.8497349510.

The spelling of 677987 in words is "six hundred seventy-seven thousand, nine hundred eighty-seven".