68190920 has 32 divisors (see below), whose sum is σ = 175348800. Its totient is φ = 23379648.

The previous prime is 68190907. The next prime is 68190923. The reversal of 68190920 is 2909186.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (68190923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121490 + ... + 122049.

It is an arithmetic number, because the mean of its divisors is an integer number (5479650).

Almost surely, 2^68190920 is an apocalyptic number.

It is an amenable number.

68190920 is an abundant number, since it is smaller than the sum of its proper divisors (107157880).

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

68190920 is a wasteful number, since it uses less digits than its factorization.

68190920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243557 (or 243553 counting only the distinct ones).

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

The square root of 68190920 is about 8257.7793625163. The cubic root of 68190920 is about 408.5471481441.

The spelling of 68190920 in words is "sixty-eight million, one hundred ninety thousand, nine hundred twenty".