691300040 has 16 divisors (see below), whose sum is σ = 1555425180. Its totient is φ = 276520000.

The previous prime is 691300039. The next prime is 691300061. The reversal of 691300040 is 40003196.

It can be written as a sum of positive squares in 2 ways, for example, as 690743524 + 556516 = 26282^2 + 746^2 .

It is a junction number, because it is equal to n+sod(n) for n = 691299979 and 691300015.

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 3 ways as a sum of consecutive naturals, for example, 8641211 + ... + 8641290.

Almost surely, 2^691300040 is an apocalyptic number.

It is an amenable number.

691300040 is an abundant number, since it is smaller than the sum of its proper divisors (864125140).

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

691300040 is a wasteful number, since it uses less digits than its factorization.

691300040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17282512 (or 17282508 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 691300040 is about 26292.5852665728. The cubic root of 691300040 is about 884.2102139251.

The spelling of 691300040 in words is "six hundred ninety-one million, three hundred thousand, forty".