28361280 has 112 divisors (see below), whose sum is σ = 93049344. Its totient is φ = 7311360.

The previous prime is 28361269. The next prime is 28361293. The reversal of 28361280 is 8216382.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29284 + ... + 30236.

Almost surely, 2^28361280 is an apocalyptic number.

28361280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28361280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46524672).

28361280 is an abundant number, since it is smaller than the sum of its proper divisors (64688064).

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

28361280 is a wasteful number, since it uses less digits than its factorization.

28361280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28361280 is about 5325.5309594443. The cubic root of 28361280 is about 304.9593424260.

The spelling of 28361280 in words is "twenty-eight million, three hundred sixty-one thousand, two hundred eighty".