688357477 has 2 divisors, whose sum is σ = 688357478. Its totient is φ = 688357476.

The previous prime is 688357469. The next prime is 688357529. The reversal of 688357477 is 774753886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591413761 + 96943716 = 24319^2 + 9846^2 .

It is a cyclic number.

It is not a de Polignac number, because 688357477 - 2³ = 688357469 is a prime.

It is a super-2 number, since 2×688357477² = 947672032283611058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688357177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344178738 + 344178739.

It is an arithmetic number, because the mean of its divisors is an integer number (344178739).

Almost surely, 2^688357477 is an apocalyptic number.

It is an amenable number.

688357477 is a deficient number, since it is larger than the sum of its proper divisors (1).

688357477 is an equidigital number, since it uses as much as digits as its factorization.

688357477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 55.

The square root of 688357477 is about 26236.5675537026. The cubic root of 688357477 is about 882.9538638105.

The spelling of 688357477 in words is "six hundred eighty-eight million, three hundred fifty-seven thousand, four hundred seventy-seven".