68720081 has 8 divisors (see below), whose sum is σ = 69648384. Its totient is φ = 67798080.

The previous prime is 68720077. The next prime is 68720107. The reversal of 68720081 is 18002786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68720081 - 2² = 68720077 is a prime.

It is a super-2 number, since 2×68720081² = 9444899065293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68720011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22841 + ... + 25673.

It is an arithmetic number, because the mean of its divisors is an integer number (8706048).

Almost surely, 2^68720081 is an apocalyptic number.

It is an amenable number.

68720081 is a deficient number, since it is larger than the sum of its proper divisors (928303).

68720081 is a wasteful number, since it uses less digits than its factorization.

68720081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3151.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 68720081 is about 8289.7575959735. The cubic root of 68720081 is about 409.6012005612.

The spelling of 68720081 in words is "sixty-eight million, seven hundred twenty thousand, eighty-one".