686798190 has 112 divisors (see below), whose sum is σ = 1996360128. Its totient is φ = 169034688.

The previous prime is 686798131. The next prime is 686798197. The reversal of 686798190 is 91897686.

It is a super-2 number, since 2×686798190² = 943383507574552200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686798197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 91147 + ... + 98393.

It is an arithmetic number, because the mean of its divisors is an integer number (17824644).

Almost surely, 2^686798190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686798190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998180064).

686798190 is an abundant number, since it is smaller than the sum of its proper divisors (1309561938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686798190 is a wasteful number, since it uses less digits than its factorization.

686798190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7285 (or 7270 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 686798190 is about 26206.8347955261. The cubic root of 686798190 is about 882.2866623392.

The spelling of 686798190 in words is "six hundred eighty-six million, seven hundred ninety-eight thousand, one hundred ninety".