68578681 has 2 divisors, whose sum is σ = 68578682. Its totient is φ = 68578680.

The previous prime is 68578669. The next prime is 68578711. The reversal of 68578681 is 18687586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45104656 + 23474025 = 6716^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 68578681 - 2⁷ = 68578553 is a prime.

It is a super-2 number, since 2×68578681² = 9406070975399522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68578381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34289340 + 34289341.

It is an arithmetic number, because the mean of its divisors is an integer number (34289341).

Almost surely, 2^68578681 is an apocalyptic number.

It is an amenable number.

68578681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68578681 is an equidigital number, since it uses as much as digits as its factorization.

68578681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 49.

The square root of 68578681 is about 8281.2246075082. The cubic root of 68578681 is about 409.3200727424.

The spelling of 68578681 in words is "sixty-eight million, five hundred seventy-eight thousand, six hundred eighty-one".