691716240 has 80 divisors (see below), whose sum is σ = 2382585600. Its totient is φ = 184457088.

The previous prime is 691716229. The next prime is 691716253. The reversal of 691716240 is 42617196.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 691716195 and 691716204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157960 + ... + 162279.

It is an arithmetic number, because the mean of its divisors is an integer number (29782320).

Almost surely, 2^691716240 is an apocalyptic number.

691716240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691716240 is an abundant number, since it is smaller than the sum of its proper divisors (1690869360).

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

691716240 is a wasteful number, since it uses less digits than its factorization.

691716240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320261 (or 320249 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 691716240 is about 26300.4988545845. The cubic root of 691716240 is about 884.3876257775.

The spelling of 691716240 in words is "six hundred ninety-one million, seven hundred sixteen thousand, two hundred forty".