68720285 has 16 divisors (see below), whose sum is σ = 87620400. Its totient is φ = 51641856.

The previous prime is 68720269. The next prime is 68720293. The reversal of 68720285 is 58202786.

It can be written as a sum of positive squares in 8 ways, for example, as 376996 + 68343289 = 614^2 + 8267^2 .

It is a cyclic number.

It is not a de Polignac number, because 68720285 - 2⁴ = 68720269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1040 + ... + 11769.

It is an arithmetic number, because the mean of its divisors is an integer number (5476275).

Almost surely, 2^68720285 is an apocalyptic number.

It is an amenable number.

68720285 is a deficient number, since it is larger than the sum of its proper divisors (18900115).

68720285 is a wasteful number, since it uses less digits than its factorization.

68720285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 68720285 is about 8289.7699003048. The cubic root of 68720285 is about 409.6016058700.

The spelling of 68720285 in words is "sixty-eight million, seven hundred twenty thousand, two hundred eighty-five".