68115990 has 32 divisors (see below), whose sum is σ = 168754176. Its totient is φ = 17578080.

The previous prime is 68115979. The next prime is 68115997. The reversal of 68115990 is 9951186.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68115997) 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, 35692 + ... + 37551.

It is an arithmetic number, because the mean of its divisors is an integer number (5273568).

Almost surely, 2^68115990 is an apocalyptic number.

68115990 is an abundant number, since it is smaller than the sum of its proper divisors (100638186).

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

68115990 is a wasteful number, since it uses less digits than its factorization.

68115990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73284.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 68115990 is about 8253.2411814995. The cubic root of 68115990 is about 408.3974524698.

The spelling of 68115990 in words is "sixty-eight million, one hundred fifteen thousand, nine hundred ninety".