78428250 has 96 divisors (see below), whose sum is σ = 220094784. Its totient is φ = 20898000.

The previous prime is 78428237. The next prime is 78428269. The reversal of 78428250 is 5282487.

It is a happy 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 47 ways as a sum of consecutive naturals, for example, 60105 + ... + 61395.

It is an arithmetic number, because the mean of its divisors is an integer number (2292654).

Almost surely, 2^78428250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78428250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110047392).

78428250 is an abundant number, since it is smaller than the sum of its proper divisors (141666534).

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

78428250 is a wasteful number, since it uses less digits than its factorization.

78428250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323 (or 1301 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 78428250 is about 8855.9725609331. The cubic root of 78428250 is about 428.0463927642.

The spelling of 78428250 in words is "seventy-eight million, four hundred twenty-eight thousand, two hundred fifty".