691361892 has 240 divisors, whose sum is σ = 2100288960. Its totient is φ = 196515072.

The previous prime is 691361887. The next prime is 691361893. The reversal of 691361892 is 298163196.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (691361893) 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 79 ways as a sum of consecutive naturals, for example, 4241403 + ... + 4241565.

It is an arithmetic number, because the mean of its divisors is an integer number (8751204).

Almost surely, 2^691361892 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 691361892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050144480).

691361892 is an abundant number, since it is smaller than the sum of its proper divisors (1408927068).

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

691361892 is a wasteful number, since it uses less digits than its factorization.

691361892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 253 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 691361892 is about 26293.7614654123. The cubic root of 691361892 is about 884.2365838253.

The spelling of 691361892 in words is "six hundred ninety-one million, three hundred sixty-one thousand, eight hundred ninety-two".