78928220 has 72 divisors (see below), whose sum is σ = 197399664. Its totient is φ = 26417664.

The previous prime is 78928217. The next prime is 78928237. The reversal of 78928220 is 2282987.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 41204 + ... + 43076.

It is an arithmetic number, because the mean of its divisors is an integer number (2741662).

Almost surely, 2^78928220 is an apocalyptic number.

78928220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78928220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98699832).

78928220 is an abundant number, since it is smaller than the sum of its proper divisors (118471444).

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

78928220 is a wasteful number, since it uses less digits than its factorization.

78928220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939 (or 1930 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 78928220 is about 8884.1555591964. The cubic root of 78928220 is about 428.9540469829.

The spelling of 78928220 in words is "seventy-eight million, nine hundred twenty-eight thousand, two hundred twenty".