688547473 has 4 divisors (see below), whose sum is σ = 689453028. Its totient is φ = 687641920.

The previous prime is 688547449. The next prime is 688547491. The reversal of 688547473 is 374745886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19963024 + 668584449 = 4468^2 + 25857^2 .

It is a cyclic number.

It is not a de Polignac number, because 688547473 - 2¹⁷ = 688416401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 688547473.

It is not an unprimeable number, because it can be changed into a prime (688544473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451636 + ... + 453157.

It is an arithmetic number, because the mean of its divisors is an integer number (172363257).

Almost surely, 2^688547473 is an apocalyptic number.

It is an amenable number.

688547473 is a deficient number, since it is larger than the sum of its proper divisors (905555).

688547473 is an equidigital number, since it uses as much as digits as its factorization.

688547473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905554.

The product of its digits is 4515840, while the sum is 52.

The square root of 688547473 is about 26240.1881281366. The cubic root of 688547473 is about 883.0350920849.

The spelling of 688547473 in words is "six hundred eighty-eight million, five hundred forty-seven thousand, four hundred seventy-three".