68220140 has 12 divisors (see below), whose sum is σ = 143262336. Its totient is φ = 27288048.

The previous prime is 68220121. The next prime is 68220149. The reversal of 68220140 is 4102286.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (68220149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1705484 + ... + 1705523.

It is an arithmetic number, because the mean of its divisors is an integer number (11938528).

Almost surely, 2^68220140 is an apocalyptic number.

It is an amenable number.

68220140 is an abundant number, since it is smaller than the sum of its proper divisors (75042196).

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

68220140 is a wasteful number, since it uses less digits than its factorization.

68220140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3411016 (or 3411014 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 68220140 is about 8259.5484138057. The cubic root of 68220140 is about 408.6054943431.

The spelling of 68220140 in words is "sixty-eight million, two hundred twenty thousand, one hundred forty".