28051590 has 96 divisors (see below), whose sum is σ = 80075520. Its totient is φ = 6160320.

The previous prime is 28051577. The next prime is 28051601. The reversal of 28051590 is 9515082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 201741 + ... + 201879.

It is an arithmetic number, because the mean of its divisors is an integer number (834120).

Almost surely, 2^28051590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28051590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40037760).

28051590 is an abundant number, since it is smaller than the sum of its proper divisors (52023930).

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

28051590 is a wasteful number, since it uses less digits than its factorization.

28051590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 28051590 is about 5296.3751755328. The cubic root of 28051590 is about 303.8452799370.

The spelling of 28051590 in words is "twenty-eight million, fifty-one thousand, five hundred ninety".