260688457 has 2 divisors, whose sum is σ = 260688458. Its totient is φ = 260688456.

The previous prime is 260688443. The next prime is 260688469. The reversal of 260688457 is 754886062.

260688457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256672441 + 4016016 = 16021^2 + 2004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260688457 is a prime.

It is a super-2 number, since 2×260688457² = 135916943226081698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (260688427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130344228 + 130344229.

It is an arithmetic number, because the mean of its divisors is an integer number (130344229).

Almost surely, 2^260688457 is an apocalyptic number.

It is an amenable number.

260688457 is a deficient number, since it is larger than the sum of its proper divisors (1).

260688457 is an equidigital number, since it uses as much as digits as its factorization.

260688457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 260688457 is about 16145.8495285940. The cubic root of 260688457 is about 638.8132769474.

The spelling of 260688457 in words is "two hundred sixty million, six hundred eighty-eight thousand, four hundred fifty-seven".