687240693 has 16 divisors (see below), whose sum is σ = 1030707200. Its totient is φ = 458159004.

The previous prime is 687240677. The next prime is 687240707. The reversal of 687240693 is 396042786.

It is not a de Polignac number, because 687240693 - 2⁴ = 687240677 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 (687240193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154933 + ... + 159306.

It is an arithmetic number, because the mean of its divisors is an integer number (64419200).

Almost surely, 2^687240693 is an apocalyptic number.

It is an amenable number.

687240693 is a deficient number, since it is larger than the sum of its proper divisors (343466507).

687240693 is an frugal number, since it uses more digits than its factorization.

687240693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314260 (or 314242 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 687240693 is about 26215.2759474319. The cubic root of 687240693 is about 882.4761069644.

The spelling of 687240693 in words is "six hundred eighty-seven million, two hundred forty thousand, six hundred ninety-three".