28785078 has 64 divisors (see below), whose sum is σ = 73635840. Its totient is φ = 8164800.

The previous prime is 28785073. The next prime is 28785083. The reversal of 28785078 is 87058782.

It is a happy number.

28785078 is a nontrivial binomial coefficient, being equal to C(7588, 2).

It is an interprime number because it is at equal distance from previous prime (28785073) and next prime (28785083).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102298 + ... + 102578.

It is an arithmetic number, because the mean of its divisors is an integer number (1150560).

Almost surely, 2^28785078 is an apocalyptic number.

28785078 is the 7587-th triangular number and also the 3794-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28785078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36817920).

28785078 is an abundant number, since it is smaller than the sum of its proper divisors (44850762).

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

28785078 is a wasteful number, since it uses less digits than its factorization.

28785078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 564 counting only the distinct ones).

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

The square root of 28785078 is about 5365.1726906037. The cubic root of 28785078 is about 306.4708246018.

The spelling of 28785078 in words is "twenty-eight million, seven hundred eighty-five thousand, seventy-eight".