68751257 has 4 divisors (see below), whose sum is σ = 71122020. Its totient is φ = 66380496.

The previous prime is 68751233. The next prime is 68751259. The reversal of 68751257 is 75215786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40246336 + 28504921 = 6344^2 + 5339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68751257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68751259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185338 + ... + 1185395.

It is an arithmetic number, because the mean of its divisors is an integer number (17780505).

Almost surely, 2^68751257 is an apocalyptic number.

It is an amenable number.

68751257 is a deficient number, since it is larger than the sum of its proper divisors (2370763).

68751257 is a wasteful number, since it uses less digits than its factorization.

68751257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370762.

The product of its digits is 117600, while the sum is 41.

The square root of 68751257 is about 8291.6377754941. The cubic root of 68751257 is about 409.6631319805.

The spelling of 68751257 in words is "sixty-eight million, seven hundred fifty-one thousand, two hundred fifty-seven".