78428528 has 40 divisors (see below), whose sum is σ = 164052000. Its totient is φ = 36210944.

The previous prime is 78428513. The next prime is 78428549. The reversal of 78428528 is 82582487.

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 7 ways as a sum of consecutive naturals, for example, 6998 + ... + 14346.

It is an arithmetic number, because the mean of its divisors is an integer number (4101300).

Almost surely, 2^78428528 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 78428528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82026000).

78428528 is an abundant number, since it is smaller than the sum of its proper divisors (85623472).

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

78428528 is a wasteful number, since it uses less digits than its factorization.

78428528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7409 (or 7403 counting only the distinct ones).

The product of its digits is 286720, while the sum is 44.

The square root of 78428528 is about 8855.9882565414. The cubic root of 78428528 is about 428.0468985206.

The spelling of 78428528 in words is "seventy-eight million, four hundred twenty-eight thousand, five hundred twenty-eight".