68220522 has 64 divisors (see below), whose sum is σ = 158699520. Its totient is φ = 21697200.

The previous prime is 68220521. The next prime is 68220569. The reversal of 68220522 is 22502286.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (68220521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138697 + ... + 139187.

It is an arithmetic number, because the mean of its divisors is an integer number (2479680).

Almost surely, 2^68220522 is an apocalyptic number.

68220522 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 68220522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79349760).

68220522 is an abundant number, since it is smaller than the sum of its proper divisors (90478998).

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

68220522 is a wasteful number, since it uses less digits than its factorization.

68220522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 68220522 is about 8259.5715385243. The cubic root of 68220522 is about 408.6062570064.

The spelling of 68220522 in words is "sixty-eight million, two hundred twenty thousand, five hundred twenty-two".