28533280 has 24 divisors (see below), whose sum is σ = 67410252. Its totient is φ = 11413248.

The previous prime is 28533251. The next prime is 28533287. The reversal of 28533280 is 8233582.

It can be written as a sum of positive squares in 2 ways, for example, as 27751824 + 781456 = 5268^2 + 884^2 .

It is not an unprimeable number, because it can be changed into a prime (28533287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89007 + ... + 89326.

Almost surely, 2^28533280 is an apocalyptic number.

28533280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28533280 is an abundant number, since it is smaller than the sum of its proper divisors (38876972).

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

28533280 is a wasteful number, since it uses less digits than its factorization.

28533280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178348 (or 178340 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 28533280 is about 5341.6551741946. The cubic root of 28533280 is about 305.5745864853.

The spelling of 28533280 in words is "twenty-eight million, five hundred thirty-three thousand, two hundred eighty".