686252124 has 72 divisors (see below), whose sum is σ = 1841177520. Its totient is φ = 214774272.

The previous prime is 686252101. The next prime is 686252129. The reversal of 686252124 is 421252686.

It is a happy number.

686252124 is a `hidden beast` number, since 6 + 8 + 625 + 2 + 1 + 24 = 666.

It is a super-2 number, since 2×686252124² = 941883955389022752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686252129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310407 + ... + 312609.

It is an arithmetic number, because the mean of its divisors is an integer number (25571910).

Almost surely, 2^686252124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686252124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (920588760).

686252124 is an abundant number, since it is smaller than the sum of its proper divisors (1154925396).

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

686252124 is a wasteful number, since it uses less digits than its factorization.

686252124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739 (or 2734 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 686252124 is about 26196.4143347902. The cubic root of 686252124 is about 882.0527680648.

The spelling of 686252124 in words is "six hundred eighty-six million, two hundred fifty-two thousand, one hundred twenty-four".