28130544 has 80 divisors (see below), whose sum is σ = 86973600. Its totient is φ = 8653824.

The previous prime is 28130533. The next prime is 28130549. The reversal of 28130544 is 44503182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3112 + ... + 8120.

It is an arithmetic number, because the mean of its divisors is an integer number (1087170).

Almost surely, 2^28130544 is an apocalyptic number.

28130544 is a gapful number since it is divisible by the number (24) 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 28130544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43486800).

28130544 is an abundant number, since it is smaller than the sum of its proper divisors (58843056).

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

28130544 is a wasteful number, since it uses less digits than its factorization.

28130544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5039 (or 5027 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28130544 is about 5303.8235264760. The cubic root of 28130544 is about 304.1300805268.

The spelling of 28130544 in words is "twenty-eight million, one hundred thirty thousand, five hundred forty-four".