688727573 has 2 divisors, whose sum is σ = 688727574. Its totient is φ = 688727572.

The previous prime is 688727551. The next prime is 688727581. The reversal of 688727573 is 375727886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415222129 + 273505444 = 20377^2 + 16538^2 .

It is a cyclic number.

It is not a de Polignac number, because 688727573 - 2⁸ = 688727317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688727503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344363786 + 344363787.

It is an arithmetic number, because the mean of its divisors is an integer number (344363787).

Almost surely, 2^688727573 is an apocalyptic number.

It is an amenable number.

688727573 is a deficient number, since it is larger than the sum of its proper divisors (1).

688727573 is an equidigital number, since it uses as much as digits as its factorization.

688727573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3951360, while the sum is 53.

The square root of 688727573 is about 26243.6196626913. The cubic root of 688727573 is about 883.1120757655.

The spelling of 688727573 in words is "six hundred eighty-eight million, seven hundred twenty-seven thousand, five hundred seventy-three".