68750081 has 4 divisors (see below), whose sum is σ = 69718464. Its totient is φ = 67781700.

The previous prime is 68750051. The next prime is 68750089. The reversal of 68750081 is 18005786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18005786 = 2 ⋅9002893.

It is a cyclic number.

It is not a de Polignac number, because 68750081 - 2²⁶ = 1641217 is a prime.

It is a super-2 number, since 2×68750081² = 9453147275013122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68750089) 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, 484085 + ... + 484226.

It is an arithmetic number, because the mean of its divisors is an integer number (17429616).

Almost surely, 2^68750081 is an apocalyptic number.

It is an amenable number.

68750081 is a deficient number, since it is larger than the sum of its proper divisors (968383).

68750081 is an equidigital number, since it uses as much as digits as its factorization.

68750081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968382.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 68750081 is about 8291.5668603708. The cubic root of 68750081 is about 409.6607961852.

The spelling of 68750081 in words is "sixty-eight million, seven hundred fifty thousand, eighty-one".