68728090 has 32 divisors (see below), whose sum is σ = 126491904. Its totient is φ = 26879040.

The previous prime is 68728087. The next prime is 68728091. The reversal of 68728090 is 9082786.

It is a super-3 number, since 3×68728090³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (68728091) 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 15 ways as a sum of consecutive naturals, for example, 187087 + ... + 187453.

It is an arithmetic number, because the mean of its divisors is an integer number (3952872).

Almost surely, 2^68728090 is an apocalyptic number.

68728090 is a deficient number, since it is larger than the sum of its proper divisors (57763814).

68728090 is a wasteful number, since it uses less digits than its factorization.

68728090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 68728090 is about 8290.2406478944. The cubic root of 68728090 is about 409.6171123031.

The spelling of 68728090 in words is "sixty-eight million, seven hundred twenty-eight thousand, ninety".