680820687 has 8 divisors (see below), whose sum is σ = 1008623280. Its totient is φ = 453880440.

The previous prime is 680820671. The next prime is 680820689. The reversal of 680820687 is 786028086.

It is not a de Polignac number, because 680820687 - 2⁴ = 680820671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680820689) 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, 12607764 + ... + 12607817.

It is an arithmetic number, because the mean of its divisors is an integer number (126077910).

Almost surely, 2^680820687 is an apocalyptic number.

680820687 is a deficient number, since it is larger than the sum of its proper divisors (327802593).

680820687 is a wasteful number, since it uses less digits than its factorization.

680820687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25215590 (or 25215584 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 680820687 is about 26092.5408306665. The cubic root of 680820687 is about 879.7195589676.

It can be divided in two parts, 6808 and 20687, that added together give a triangular number (27495 = T₂₃₄).

The spelling of 680820687 in words is "six hundred eighty million, eight hundred twenty thousand, six hundred eighty-seven".