688222077 has 16 divisors (see below), whose sum is σ = 958186368. Its totient is φ = 438563840.

The previous prime is 688222039. The next prime is 688222091. The reversal of 688222077 is 770222886.

It is a cyclic number.

It is not a de Polignac number, because 688222077 - 2²⁴ = 671444861 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688222097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141193 + ... + 145985.

It is an arithmetic number, because the mean of its divisors is an integer number (59886648).

Almost surely, 2^688222077 is an apocalyptic number.

It is an amenable number.

688222077 is a deficient number, since it is larger than the sum of its proper divisors (269964291).

688222077 is a wasteful number, since it uses less digits than its factorization.

688222077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900.

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 688222077 is about 26233.9870587755. The cubic root of 688222077 is about 882.8959676365.

The spelling of 688222077 in words is "six hundred eighty-eight million, two hundred twenty-two thousand, seventy-seven".