676921787 has 4 divisors (see below), whose sum is σ = 676984536. Its totient is φ = 676859040.

The previous prime is 676921769. The next prime is 676921789. The reversal of 676921787 is 787129676.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 676921787 - 2¹⁰ = 676920763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (676921789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10613 + ... + 38294.

It is an arithmetic number, because the mean of its divisors is an integer number (169246134).

Almost surely, 2^676921787 is an apocalyptic number.

676921787 is a deficient number, since it is larger than the sum of its proper divisors (62749).

676921787 is a wasteful number, since it uses less digits than its factorization.

676921787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62748.

The product of its digits is 1778112, while the sum is 53.

The square root of 676921787 is about 26017.7206342139. The cubic root of 676921787 is about 878.0370273559.

The spelling of 676921787 in words is "six hundred seventy-six million, nine hundred twenty-one thousand, seven hundred eighty-seven".