686940071424 has 40 divisors (see below), whose sum is σ = 1830051288120. Its totient is φ = 228980023296.

The previous prime is 686940071423. The next prime is 686940071431. The reversal of 686940071424 is 424170049686.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686940071423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223611769 + ... + 223614840.

It is an arithmetic number, because the mean of its divisors is an integer number (45751282203).

Almost surely, 2^686940071424 is an apocalyptic number.

686940071424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

686940071424 is an abundant number, since it is smaller than the sum of its proper divisors (1143111216696).

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

686940071424 is an equidigital number, since it uses as much as digits as its factorization.

686940071424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447226630 (or 447226614 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 686940071424 in words is "six hundred eighty-six billion, nine hundred forty million, seventy-one thousand, four hundred twenty-four".