28130550 has 96 divisors (see below), whose sum is σ = 81042432. Its totient is φ = 6324480.

The previous prime is 28130549. The next prime is 28130579. The reversal of 28130550 is 5503182.

It is a self number, because there is not a number n which added to its sum of digits gives 28130550.

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, 76467 + ... + 76833.

It is an arithmetic number, because the mean of its divisors is an integer number (844192).

Almost surely, 2^28130550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28130550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40521216).

28130550 is an abundant number, since it is smaller than the sum of its proper divisors (52911882).

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

28130550 is a wasteful number, since it uses less digits than its factorization.

28130550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 28130550 is about 5303.8240921056. The cubic root of 28130550 is about 304.1301021496.

It can be divided in two parts, 28130 and 550, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 28130550 in words is "twenty-eight million, one hundred thirty thousand, five hundred fifty".