688726077 has 16 divisors (see below), whose sum is σ = 1013062848. Its totient is φ = 413493120.

The previous prime is 688726013. The next prime is 688726091. The reversal of 688726077 is 770627886.

It is not a de Polignac number, because 688726077 - 2⁶ = 688726013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688726477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213763 + ... + 216960.

It is an arithmetic number, because the mean of its divisors is an integer number (63316428).

Almost surely, 2^688726077 is an apocalyptic number.

It is an amenable number.

688726077 is a deficient number, since it is larger than the sum of its proper divisors (324336771).

688726077 is a wasteful number, since it uses less digits than its factorization.

688726077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430780.

The product of its (nonzero) digits is 1580544, while the sum is 51.

The square root of 688726077 is about 26243.5911605100. The cubic root of 688726077 is about 883.1114363561. Note that the first 3 decimals are identical.

The spelling of 688726077 in words is "six hundred eighty-eight million, seven hundred twenty-six thousand, seventy-seven".