688581473 has 2 divisors, whose sum is σ = 688581474. Its totient is φ = 688581472.

The previous prime is 688581469. The next prime is 688581497. The reversal of 688581473 is 374185886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664453729 + 24127744 = 25777^2 + 4912^2 .

It is a cyclic number.

It is not a de Polignac number, because 688581473 - 2² = 688581469 is a prime.

It is not a weakly prime, because it can be changed into another prime (688581463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344290736 + 344290737.

It is an arithmetic number, because the mean of its divisors is an integer number (344290737).

Almost surely, 2^688581473 is an apocalyptic number.

It is an amenable number.

688581473 is a deficient number, since it is larger than the sum of its proper divisors (1).

688581473 is an equidigital number, since it uses as much as digits as its factorization.

688581473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The square root of 688581473 is about 26240.8359813479. The cubic root of 688581473 is about 883.0496264006.

The spelling of 688581473 in words is "six hundred eighty-eight million, five hundred eighty-one thousand, four hundred seventy-three".