28072590 has 144 divisors (see below), whose sum is σ = 85617648. Its totient is φ = 5870592.

The previous prime is 28072589. The next prime is 28072621. The reversal of 28072590 is 9527082.

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 71 ways as a sum of consecutive naturals, for example, 248374 + ... + 248486.

It is an arithmetic number, because the mean of its divisors is an integer number (594567).

Almost surely, 2^28072590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28072590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42808824).

28072590 is an abundant number, since it is smaller than the sum of its proper divisors (57545058).

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

28072590 is a wasteful number, since it uses less digits than its factorization.

28072590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 28072590 is about 5298.3572925955. The cubic root of 28072590 is about 303.9210826430.

The spelling of 28072590 in words is "twenty-eight million, seventy-two thousand, five hundred ninety".