688291047 has 32 divisors (see below), whose sum is σ = 1059840000. Its totient is φ = 440998560.

The previous prime is 688291039. The next prime is 688291091. The reversal of 688291047 is 740192886.

It is not a de Polignac number, because 688291047 - 2³ = 688291039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688290993 and 688291011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688291147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121954 + ... + 127472.

It is an arithmetic number, because the mean of its divisors is an integer number (33120000).

Almost surely, 2^688291047 is an apocalyptic number.

688291047 is a deficient number, since it is larger than the sum of its proper divisors (371548953).

688291047 is a wasteful number, since it uses less digits than its factorization.

688291047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5708 (or 5702 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 688291047 is about 26235.3015420063. The cubic root of 688291047 is about 882.9254597162.

The spelling of 688291047 in words is "six hundred eighty-eight million, two hundred ninety-one thousand, forty-seven".