688965427 has 2 divisors, whose sum is σ = 688965428. Its totient is φ = 688965426.

The previous prime is 688965373. The next prime is 688965449. The reversal of 688965427 is 724569886.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688965427 is a prime.

It is not a weakly prime, because it can be changed into another prime (688965467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344482713 + 344482714.

It is an arithmetic number, because the mean of its divisors is an integer number (344482714).

Almost surely, 2^688965427 is an apocalyptic number.

688965427 is a deficient number, since it is larger than the sum of its proper divisors (1).

688965427 is an equidigital number, since it uses as much as digits as its factorization.

688965427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 55.

The square root of 688965427 is about 26248.1509253509. The cubic root of 688965427 is about 883.2137258092.

It can be divided in two parts, 68 and 8965427, that added together give a triangular number (8965495 = T₄₂₃₄).

The spelling of 688965427 in words is "six hundred eighty-eight million, nine hundred sixty-five thousand, four hundred twenty-seven".