691835136 has 72 divisors (see below), whose sum is σ = 1904844480. Its totient is φ = 222652416.

The previous prime is 691835119. The next prime is 691835141. The reversal of 691835136 is 631538196.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6741 + ... + 37803.

Almost surely, 2^691835136 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 691835136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952422240).

691835136 is an abundant number, since it is smaller than the sum of its proper divisors (1213009344).

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

691835136 is a wasteful number, since it uses less digits than its factorization.

691835136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31111 (or 31097 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 691835136 is about 26302.7590948174. The cubic root of 691835136 is about 884.4382940145.

The spelling of 691835136 in words is "six hundred ninety-one million, eight hundred thirty-five thousand, one hundred thirty-six".