28236078 has 48 divisors (see below), whose sum is σ = 66904656. Its totient is φ = 8553600.

The previous prime is 28236073. The next prime is 28236083. The reversal of 28236078 is 87063282.

It is a happy number.

28236078 is a `hidden beast` number, since 28 + 23 + 607 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (28236073) and next prime (28236083).

It is a super-2 number, since 2×28236078² = 1594552201644168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28236073) 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, 14778 + ... + 16578.

It is an arithmetic number, because the mean of its divisors is an integer number (1393847).

Almost surely, 2^28236078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28236078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33452328).

28236078 is an abundant number, since it is smaller than the sum of its proper divisors (38668578).

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

28236078 is a wasteful number, since it uses less digits than its factorization.

28236078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889 (or 1886 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28236078 is about 5313.7630733784. The cubic root of 28236078 is about 304.5099287371.

The spelling of 28236078 in words is "twenty-eight million, two hundred thirty-six thousand, seventy-eight".