28304276 has 48 divisors (see below), whose sum is σ = 66514560. Its totient is φ = 10177920.

The previous prime is 28304273. The next prime is 28304317. The reversal of 28304276 is 67240382.

It is a super-2 number, since 2×28304276² = 1602264079768352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28304273) 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, 470 + ... + 7538.

It is an arithmetic number, because the mean of its divisors is an integer number (1385720).

Almost surely, 2^28304276 is an apocalyptic number.

28304276 is a gapful number since it is divisible by the number (26) 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 28304276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33257280).

28304276 is an abundant number, since it is smaller than the sum of its proper divisors (38210284).

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

28304276 is a wasteful number, since it uses less digits than its factorization.

28304276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104 (or 7102 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 28304276 is about 5320.1763128678. The cubic root of 28304276 is about 304.7548904155.

The spelling of 28304276 in words is "twenty-eight million, three hundred four thousand, two hundred seventy-six".