691231632 has 360 divisors, whose sum is σ = 2359241856. Its totient is φ = 173601792.

The previous prime is 691231631. The next prime is 691231637. The reversal of 691231632 is 236132196.

It is a junction number, because it is equal to n+sod(n) for n = 691231593 and 691231602.

It is not an unprimeable number, because it can be changed into a prime (691231631) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14707033 + ... + 14707079.

Almost surely, 2^691231632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691231632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179620928).

691231632 is an abundant number, since it is smaller than the sum of its proper divisors (1668010224).

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

691231632 is a wasteful number, since it uses less digits than its factorization.

691231632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 109 counting only the distinct ones).

The product of its digits is 11664, while the sum is 33.

The square root of 691231632 is about 26291.2843353078. The cubic root of 691231632 is about 884.1810471166.

The spelling of 691231632 in words is "six hundred ninety-one million, two hundred thirty-one thousand, six hundred thirty-two".