691234328 has 24 divisors (see below), whose sum is σ = 1301680380. Its totient is φ = 344124960.

The previous prime is 691234309. The next prime is 691234337. The reversal of 691234328 is 823432196.

It is a super-2 number, since 2×691234328² = 955609792411223168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 691234291 and 691234300.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1210283 + ... + 1210853.

Almost surely, 2^691234328 is an apocalyptic number.

It is an amenable number.

691234328 is a deficient number, since it is larger than the sum of its proper divisors (610446052).

691234328 is an equidigital number, since it uses as much as digits as its factorization.

691234328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355 (or 962 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 691234328 is about 26291.3356070018. The cubic root of 691234328 is about 884.1821966343.

The spelling of 691234328 in words is "six hundred ninety-one million, two hundred thirty-four thousand, three hundred twenty-eight".