686672019 has 16 divisors (see below), whose sum is σ = 1109773440. Its totient is φ = 416164680.

The previous prime is 686672003. The next prime is 686672053. The reversal of 686672019 is 910276686.

686672019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686672019 - 2⁴ = 686672003 is a prime.

It is a super-2 number, since 2×686672019² = 943036923355072722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686672089) 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, 1155717 + ... + 1156310.

It is an arithmetic number, because the mean of its divisors is an integer number (69360840).

Almost surely, 2^686672019 is an apocalyptic number.

686672019 is a deficient number, since it is larger than the sum of its proper divisors (423101421).

686672019 is a wasteful number, since it uses less digits than its factorization.

686672019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312047 (or 2312041 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 686672019 is about 26204.4274694182. The cubic root of 686672019 is about 882.2326310339.

The spelling of 686672019 in words is "six hundred eighty-six million, six hundred seventy-two thousand, nineteen".