691536636 has 48 divisors (see below), whose sum is σ = 2048999680. Its totient is φ = 197581680.

The previous prime is 691536631. The next prime is 691536641. The reversal of 691536636 is 636635196.

691536636 is a `hidden beast` number, since 6 + 9 + 1 + 5 + 3 + 6 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (691536631) and next prime (691536641).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 691536591 and 691536600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691536631) 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 15 ways as a sum of consecutive naturals, for example, 456610 + ... + 458121.

Almost surely, 2^691536636 is an apocalyptic number.

It is an amenable number.

691536636 is an abundant number, since it is smaller than the sum of its proper divisors (1357463044).

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

691536636 is a wasteful number, since it uses less digits than its factorization.

691536636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914751 (or 914743 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 691536636 is about 26297.0841729649. The cubic root of 691536636 is about 884.3110754546.

The spelling of 691536636 in words is "six hundred ninety-one million, five hundred thirty-six thousand, six hundred thirty-six".