68220756 has 36 divisors (see below), whose sum is σ = 175375200. Its totient is φ = 22354128.

The previous prime is 68220751. The next prime is 68220793. The reversal of 68220756 is 65702286.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 68220756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68220751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13936 + ... + 18183.

Almost surely, 2^68220756 is an apocalyptic number.

It is an amenable number.

68220756 is an abundant number, since it is smaller than the sum of its proper divisors (107154444).

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

68220756 is a wasteful number, since it uses less digits than its factorization.

68220756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32188 (or 32183 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 68220756 is about 8259.5857038958. The cubic root of 68220756 is about 408.6067241863.

The spelling of 68220756 in words is "sixty-eight million, two hundred twenty thousand, seven hundred fifty-six".