688332501 has 6 divisors (see below), whose sum is σ = 994258070. Its totient is φ = 458888328.

The previous prime is 688332457. The next prime is 688332503. The reversal of 688332501 is 105233886.

688332501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 656691876 + 31640625 = 25626^2 + 5625^2 .

It is not a de Polignac number, because 688332501 - 2⁷ = 688332373 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 (688332503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38240686 + ... + 38240703.

Almost surely, 2^688332501 is an apocalyptic number.

It is an amenable number.

688332501 is a deficient number, since it is larger than the sum of its proper divisors (305925569).

688332501 is a wasteful number, since it uses less digits than its factorization.

688332501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76481395 (or 76481392 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 688332501 is about 26236.0915724885. The cubic root of 688332501 is about 882.9431848037.

The spelling of 688332501 in words is "six hundred eighty-eight million, three hundred thirty-two thousand, five hundred one".