68257815 has 32 divisors (see below), whose sum is σ = 113498112. Its totient is φ = 34992000.

The previous prime is 68257811. The next prime is 68257829. The reversal of 68257815 is 51875286.

It is not a de Polignac number, because 68257815 - 2² = 68257811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68257811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83760 + ... + 84570.

It is an arithmetic number, because the mean of its divisors is an integer number (3546816).

Almost surely, 2^68257815 is an apocalyptic number.

68257815 is a deficient number, since it is larger than the sum of its proper divisors (45240297).

68257815 is a wasteful number, since it uses less digits than its factorization.

68257815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031.

The product of its digits is 134400, while the sum is 42.

The square root of 68257815 is about 8261.8287927069. The cubic root of 68257815 is about 408.6806988160.

The spelling of 68257815 in words is "sixty-eight million, two hundred fifty-seven thousand, eight hundred fifteen".