68905861890 has 32 divisors (see below), whose sum is σ = 174077968320. Its totient is φ = 17407796544.

The previous prime is 68905861823. The next prime is 68905861891. The reversal of 68905861890 is 9816850986.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68905861891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60443169 + ... + 60444308.

It is an arithmetic number, because the mean of its divisors is an integer number (5439936510).

Almost surely, 2^68905861890 is an apocalyptic number.

68905861890 is an abundant number, since it is smaller than the sum of its proper divisors (105172106430).

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

68905861890 is a wasteful number, since it uses less digits than its factorization.

68905861890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120887506.

The product of its (nonzero) digits is 7464960, while the sum is 60.

The spelling of 68905861890 in words is "sixty-eight billion, nine hundred five million, eight hundred sixty-one thousand, eight hundred ninety".