68406220 has 24 divisors (see below), whose sum is σ = 144975600. Its totient is φ = 27110592.

The previous prime is 68406211. The next prime is 68406227. The reversal of 68406220 is 2260486.

It is not an unprimeable number, because it can be changed into a prime (68406227) 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 7 ways as a sum of consecutive naturals, for example, 13510 + ... + 17869.

It is an arithmetic number, because the mean of its divisors is an integer number (6040650).

Almost surely, 2^68406220 is an apocalyptic number.

It is an amenable number.

68406220 is an abundant number, since it is smaller than the sum of its proper divisors (76569380).

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

68406220 is a wasteful number, since it uses less digits than its factorization.

68406220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31497 (or 31495 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 68406220 is about 8270.8052812287. The cubic root of 68406220 is about 408.9766666706.

The spelling of 68406220 in words is "sixty-eight million, four hundred six thousand, two hundred twenty".