686696970 has 64 divisors (see below), whose sum is σ = 1724405760. Its totient is φ = 174681408.

The previous prime is 686696939. The next prime is 686696977. The reversal of 686696970 is 79696686.

It is a self number, because there is not a number n which added to its sum of digits gives 686696970.

It is not an unprimeable number, because it can be changed into a prime (686696977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301777 + ... + 304043.

It is an arithmetic number, because the mean of its divisors is an integer number (26943840).

Almost surely, 2^686696970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686696970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862202880).

686696970 is an abundant number, since it is smaller than the sum of its proper divisors (1037708790).

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

686696970 is a wasteful number, since it uses less digits than its factorization.

686696970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739.

The product of its (nonzero) digits is 5878656, while the sum is 57.

The square root of 686696970 is about 26204.9035487635. The cubic root of 686696970 is about 882.2433165428.

The spelling of 686696970 in words is "six hundred eighty-six million, six hundred ninety-six thousand, nine hundred seventy".