68606257 has 10 divisors (see below), whose sum is σ = 71789018. Its totient is φ = 65557632.

The previous prime is 68606249. The next prime is 68606269. The reversal of 68606257 is 75260686.

It can be written as a sum of positive squares in 5 ways, for example, as 8946081 + 59660176 = 2991^2 + 7724^2 .

It is not a de Polignac number, because 68606257 - 2³ = 68606249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68606287) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 707233 + ... + 707329.

Almost surely, 2^68606257 is an apocalyptic number.

It is an amenable number.

68606257 is a deficient number, since it is larger than the sum of its proper divisors (3182761).

68606257 is an frugal number, since it uses more digits than its factorization.

68606257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 68606257 is about 8282.8894113105. The cubic root of 68606257 is about 409.3749289435.

The spelling of 68606257 in words is "sixty-eight million, six hundred six thousand, two hundred fifty-seven".