28075278 has 64 divisors (see below), whose sum is σ = 71129088. Its totient is φ = 7175520.

The previous prime is 28075253. The next prime is 28075291. The reversal of 28075278 is 87257082.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30501 + ... + 31407.

It is an arithmetic number, because the mean of its divisors is an integer number (1111392).

Almost surely, 2^28075278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28075278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35564544).

28075278 is an abundant number, since it is smaller than the sum of its proper divisors (43053810).

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

28075278 is a wasteful number, since it uses less digits than its factorization.

28075278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997.

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 28075278 is about 5298.6109500510. The cubic root of 28075278 is about 303.9307826599.

The spelling of 28075278 in words is "twenty-eight million, seventy-five thousand, two hundred seventy-eight".