686144452 has 36 divisors (see below), whose sum is σ = 1441864704. Its totient is φ = 284573520.

The previous prime is 686144443. The next prime is 686144477. The reversal of 686144452 is 254441686.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50388 + ... + 62539.

Almost surely, 2^686144452 is an apocalyptic number.

686144452 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

686144452 is an abundant number, since it is smaller than the sum of its proper divisors (755720252).

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

686144452 is a wasteful number, since it uses less digits than its factorization.

686144452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112976 (or 112967 counting only the distinct ones).

The product of its digits is 184320, while the sum is 40.

The square root of 686144452 is about 26194.3591637589. The cubic root of 686144452 is about 882.0066347028.

The spelling of 686144452 in words is "six hundred eighty-six million, one hundred forty-four thousand, four hundred fifty-two".