688091437 has 16 divisors (see below), whose sum is σ = 785272320. Its totient is φ = 596820400.

The previous prime is 688091429. The next prime is 688091449. The reversal of 688091437 is 734190886.

It is a happy number.

It is not a de Polignac number, because 688091437 - 2³ = 688091429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688091237) 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, 102762 + ... + 109252.

It is an arithmetic number, because the mean of its divisors is an integer number (49079520).

Almost surely, 2^688091437 is an apocalyptic number.

It is an amenable number.

688091437 is a deficient number, since it is larger than the sum of its proper divisors (97180883).

688091437 is a wasteful number, since it uses less digits than its factorization.

688091437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 688091437 is about 26231.4970407714. The cubic root of 688091437 is about 882.8400996098.

The spelling of 688091437 in words is "six hundred eighty-eight million, ninety-one thousand, four hundred thirty-seven".