28130648 has 64 divisors (see below), whose sum is σ = 68765760. Its totient is φ = 10469376.

The previous prime is 28130647. The next prime is 28130653. The reversal of 28130648 is 84603182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130647) 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, 11240 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (1074465).

Almost surely, 2^28130648 is an apocalyptic number.

28130648 is a gapful number since it is divisible by the number (28) 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 28130648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34382880).

28130648 is an abundant number, since it is smaller than the sum of its proper divisors (40635112).

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

28130648 is a wasteful number, since it uses less digits than its factorization.

28130648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28130648 is about 5303.8333307147. The cubic root of 28130648 is about 304.1304553210.

The spelling of 28130648 in words is "twenty-eight million, one hundred thirty thousand, six hundred forty-eight".