28184380 has 48 divisors (see below), whose sum is σ = 69483456. Its totient is φ = 9400320.

The previous prime is 28184371. The next prime is 28184389. The reversal of 28184380 is 8348182.

It is an interprime number because it is at equal distance from previous prime (28184371) and next prime (28184389).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28184389) 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, 2460 + ... + 7900.

It is an arithmetic number, because the mean of its divisors is an integer number (1447572).

Almost surely, 2^28184380 is an apocalyptic number.

28184380 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 28184380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34741728).

28184380 is an abundant number, since it is smaller than the sum of its proper divisors (41299076).

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

28184380 is a wasteful number, since it uses less digits than its factorization.

28184380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494 (or 5492 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 28184380 is about 5308.8963071433. The cubic root of 28184380 is about 304.3239707596.

The spelling of 28184380 in words is "twenty-eight million, one hundred eighty-four thousand, three hundred eighty".