686748080 has 20 divisors (see below), whose sum is σ = 1596689472. Its totient is φ = 274699200.

The previous prime is 686748079. The next prime is 686748091. The reversal of 686748080 is 80847686.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4292096 + ... + 4292255.

Almost surely, 2^686748080 is an apocalyptic number.

It is an amenable number.

686748080 is an abundant number, since it is smaller than the sum of its proper divisors (909941392).

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

686748080 is a wasteful number, since it uses less digits than its factorization.

686748080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8584364 (or 8584358 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 686748080 is about 26205.8787297812. The cubic root of 686748080 is about 882.2652040901.

The spelling of 686748080 in words is "six hundred eighty-six million, seven hundred forty-eight thousand, eighty".