688320007 has 2 divisors, whose sum is σ = 688320008. Its totient is φ = 688320006.

The previous prime is 688319999. The next prime is 688320023. The reversal of 688320007 is 700023886.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688320007 - 2³ = 688319999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688320047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344160003 + 344160004.

It is an arithmetic number, because the mean of its divisors is an integer number (344160004).

Almost surely, 2^688320007 is an apocalyptic number.

688320007 is a deficient number, since it is larger than the sum of its proper divisors (1).

688320007 is an equidigital number, since it uses as much as digits as its factorization.

688320007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 688320007 is about 26235.8534642958. The cubic root of 688320007 is about 882.9378426380.

The spelling of 688320007 in words is "six hundred eighty-eight million, three hundred twenty thousand, seven".