688571393 has 4 divisors (see below), whose sum is σ = 689111040. Its totient is φ = 688031748.

The previous prime is 688571363. The next prime is 688571399. The reversal of 688571393 is 393175886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688571393 - 2⁶ = 688571329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688571399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267905 + ... + 270462.

It is an arithmetic number, because the mean of its divisors is an integer number (172277760).

Almost surely, 2^688571393 is an apocalyptic number.

It is an amenable number.

688571393 is a deficient number, since it is larger than the sum of its proper divisors (539647).

688571393 is a wasteful number, since it uses less digits than its factorization.

688571393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539646.

The product of its digits is 1088640, while the sum is 50.

The square root of 688571393 is about 26240.6439135933. The cubic root of 688571393 is about 883.0453174534.

The spelling of 688571393 in words is "six hundred eighty-eight million, five hundred seventy-one thousand, three hundred ninety-three".