686019240 has 64 divisors (see below), whose sum is σ = 2286734400. Its totient is φ = 182938176.

The previous prime is 686019239. The next prime is 686019251. The reversal of 686019240 is 42910686.

686019240 is a `hidden beast` number, since 6 + 8 + 601 + 9 + 2 + 40 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 686019195 and 686019204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316522 + ... + 318681.

It is an arithmetic number, because the mean of its divisors is an integer number (35730225).

Almost surely, 2^686019240 is an apocalyptic number.

686019240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686019240 is an abundant number, since it is smaller than the sum of its proper divisors (1600715160).

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

686019240 is a wasteful number, since it uses less digits than its factorization.

686019240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635223 (or 635213 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 686019240 is about 26191.9689981490. The cubic root of 686019240 is about 881.9529800469.

It can be divided in two parts, 68601 and 9240, that added together give a square (77841 = 279²).

The spelling of 686019240 in words is "six hundred eighty-six million, nineteen thousand, two hundred forty".