686720712 has 64 divisors (see below), whose sum is σ = 1822996800. Its totient is φ = 214824960.

The previous prime is 686720681. The next prime is 686720717. The reversal of 686720712 is 217027686.

It is not an unprimeable number, because it can be changed into a prime (686720717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152412 + ... + 156852.

It is an arithmetic number, because the mean of its divisors is an integer number (28484325).

Almost surely, 2^686720712 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 686720712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911498400).

686720712 is an abundant number, since it is smaller than the sum of its proper divisors (1136276088).

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

686720712 is a wasteful number, since it uses less digits than its factorization.

686720712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4846 (or 4842 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 686720712 is about 26205.3565516671. The cubic root of 686720712 is about 882.2534840452.

The spelling of 686720712 in words is "six hundred eighty-six million, seven hundred twenty thousand, seven hundred twelve".