68509290 has 32 divisors (see below), whose sum is σ = 164742336. Its totient is φ = 18233600.

The previous prime is 68509289. The next prime is 68509297. The reversal of 68509290 is 9290586.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (68509297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15865 + ... + 19715.

It is an arithmetic number, because the mean of its divisors is an integer number (5148198).

Almost surely, 2^68509290 is an apocalyptic number.

68509290 is an abundant number, since it is smaller than the sum of its proper divisors (96233046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68509290 is a wasteful number, since it uses less digits than its factorization.

68509290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 68509290 is about 8277.0338890209. The cubic root of 68509290 is about 409.1819699871.

The spelling of 68509290 in words is "sixty-eight million, five hundred nine thousand, two hundred ninety".