28758078 has 48 divisors (see below), whose sum is σ = 66044160. Its totient is φ = 9374616.

The previous prime is 28758071. The next prime is 28758083. The reversal of 28758078 is 87085782.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28758071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22213 + ... + 23471.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^28758078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28758078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33022080).

28758078 is an abundant number, since it is smaller than the sum of its proper divisors (37286082).

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

28758078 is a wasteful number, since it uses less digits than its factorization.

28758078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 28758078 is about 5362.6558718605. The cubic root of 28758078 is about 306.3749728460.

The spelling of 28758078 in words is "twenty-eight million, seven hundred fifty-eight thousand, seventy-eight".