68720489 has 4 divisors (see below), whose sum is σ = 70017156. Its totient is φ = 67423824.

The previous prime is 68720453. The next prime is 68720497. The reversal of 68720489 is 98402786.

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 61387225 + 7333264 = 7835^2 + 2708^2 .

It is a cyclic number.

It is not a de Polignac number, because 68720489 - 2⁸ = 68720233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68720419) 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, 648254 + ... + 648359.

It is an arithmetic number, because the mean of its divisors is an integer number (17504289).

Almost surely, 2^68720489 is an apocalyptic number.

It is an amenable number.

68720489 is a deficient number, since it is larger than the sum of its proper divisors (1296667).

68720489 is a wasteful number, since it uses less digits than its factorization.

68720489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296666.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 68720489 is about 8289.7822046179. The cubic root of 68720489 is about 409.6020111780.

The spelling of 68720489 in words is "sixty-eight million, seven hundred twenty thousand, four hundred eighty-nine".