686899773 has 48 divisors (see below), whose sum is σ = 1229993856. Its totient is φ = 360391680.

The previous prime is 686899753. The next prime is 686899789. The reversal of 686899773 is 377998686.

It is a happy number.

It is not a de Polignac number, because 686899773 - 2⁸ = 686899517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 686899773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686899753) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36090 + ... + 51732.

It is an arithmetic number, because the mean of its divisors is an integer number (25624872).

Almost surely, 2^686899773 is an apocalyptic number.

686899773 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

686899773 is a deficient number, since it is larger than the sum of its proper divisors (543094083).

686899773 is a wasteful number, since it uses less digits than its factorization.

686899773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15714 (or 15711 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The square root of 686899773 is about 26208.7728251439. The cubic root of 686899773 is about 882.3301593028.

The spelling of 686899773 in words is "six hundred eighty-six million, eight hundred ninety-nine thousand, seven hundred seventy-three".