691689746 has 16 divisors (see below), whose sum is σ = 1147363488. Its totient is φ = 310096800.

The previous prime is 691689743. The next prime is 691689751. The reversal of 691689746 is 647986196.

It is a junction number, because it is equal to n+sod(n) for n = 691689691 and 691689700.

It is not an unprimeable number, because it can be changed into a prime (691689743) 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 7 ways as a sum of consecutive naturals, for example, 213740 + ... + 216951.

It is an arithmetic number, because the mean of its divisors is an integer number (71710218).

Almost surely, 2^691689746 is an apocalyptic number.

691689746 is a deficient number, since it is larger than the sum of its proper divisors (455673742).

691689746 is a wasteful number, since it uses less digits than its factorization.

691689746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430777.

The product of its digits is 3919104, while the sum is 56.

The square root of 691689746 is about 26299.9951711022. The cubic root of 691689746 is about 884.3763344110.

The spelling of 691689746 in words is "six hundred ninety-one million, six hundred eighty-nine thousand, seven hundred forty-six".