68109290 has 16 divisors (see below), whose sum is σ = 122846760. Its totient is φ = 27188160.

The previous prime is 68109289. The next prime is 68109343. The reversal of 68109290 is 9290186.

It can be written as a sum of positive squares in 4 ways, for example, as 51940849 + 16168441 = 7207^2 + 4021^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68109290.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1601 + ... + 11780.

Almost surely, 2^68109290 is an apocalyptic number.

68109290 is a deficient number, since it is larger than the sum of its proper divisors (54737470).

68109290 is a wasteful number, since it uses less digits than its factorization.

68109290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13897.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 68109290 is about 8252.8352703783. The cubic root of 68109290 is about 408.3840618174.

The spelling of 68109290 in words is "sixty-eight million, one hundred nine thousand, two hundred ninety".