68720028 has 48 divisors (see below), whose sum is σ = 173290656. Its totient is φ = 21070080.

The previous prime is 68720027. The next prime is 68720033. The reversal of 68720028 is 82002786.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68720027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57598 + ... + 58778.

It is an arithmetic number, because the mean of its divisors is an integer number (3610222).

Almost surely, 2^68720028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68720028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86645328).

68720028 is an abundant number, since it is smaller than the sum of its proper divisors (104570628).

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

68720028 is a wasteful number, since it uses less digits than its factorization.

68720028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 68720028 is about 8289.7543992570. The cubic root of 68720028 is about 409.6010952602.

The spelling of 68720028 in words is "sixty-eight million, seven hundred twenty thousand, twenty-eight".