686948770 has 8 divisors (see below), whose sum is σ = 1236507804. Its totient is φ = 274779504.

The previous prime is 686948737. The next prime is 686948777. The reversal of 686948770 is 77849686.

It can be written as a sum of positive squares in 2 ways, for example, as 668894769 + 18054001 = 25863^2 + 4249^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×686948770² = 943797225209025800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686948777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34347429 + ... + 34347448.

Almost surely, 2^686948770 is an apocalyptic number.

686948770 is a deficient number, since it is larger than the sum of its proper divisors (549559034).

686948770 is a wasteful number, since it uses less digits than its factorization.

686948770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68694884.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The square root of 686948770 is about 26209.7075527370. The cubic root of 686948770 is about 882.3511378621.

The spelling of 686948770 in words is "six hundred eighty-six million, nine hundred forty-eight thousand, seven hundred seventy".