68656757 has 6 divisors (see below), whose sum is σ = 74344482. Its totient is φ = 63375312.

The previous prime is 68656729. The next prime is 68656759. The reversal of 68656757 is 75765686.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8532241 + 60124516 = 2921^2 + 7754^2 .

It is not a de Polignac number, because 68656757 - 2⁸ = 68656501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68656759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202958 + ... + 203295.

It is an arithmetic number, because the mean of its divisors is an integer number (12390747).

Almost surely, 2^68656757 is an apocalyptic number.

It is an amenable number.

68656757 is a deficient number, since it is larger than the sum of its proper divisors (5687725).

68656757 is a wasteful number, since it uses less digits than its factorization.

68656757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406279 (or 406266 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 50.

The square root of 68656757 is about 8285.9373036489. The cubic root of 68656757 is about 409.4753491502.

The spelling of 68656757 in words is "sixty-eight million, six hundred fifty-six thousand, seven hundred fifty-seven".