68508890 has 32 divisors (see below), whose sum is σ = 127448640. Its totient is φ = 26498304.

The previous prime is 68508887. The next prime is 68508893. The reversal of 68508890 is 9880586.

It is an interprime number because it is at equal distance from previous prime (68508887) and next prime (68508893).

It is a Smith number, since the sum of its digits (44) 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 (68508893) 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, 45266 + ... + 46754.

It is an arithmetic number, because the mean of its divisors is an integer number (3982770).

Almost surely, 2^68508890 is an apocalyptic number.

68508890 is a deficient number, since it is larger than the sum of its proper divisors (58939750).

68508890 is a wasteful number, since it uses less digits than its factorization.

68508890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 68508890 is about 8277.0097257403. The cubic root of 68508890 is about 409.1811736323.

The spelling of 68508890 in words is "sixty-eight million, five hundred eight thousand, eight hundred ninety".