28233520 has 40 divisors (see below), whose sum is σ = 75021984. Its totient is φ = 9679872.

The previous prime is 28233503. The next prime is 28233533. The reversal of 28233520 is 2533282.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24649 + ... + 25768.

Almost surely, 2^28233520 is an apocalyptic number.

28233520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28233520 is an abundant number, since it is smaller than the sum of its proper divisors (46788464).

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

28233520 is a wasteful number, since it uses less digits than its factorization.

28233520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50437 (or 50431 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 28233520 is about 5313.5223722122. The cubic root of 28233520 is about 304.5007329377.

The spelling of 28233520 in words is "twenty-eight million, two hundred thirty-three thousand, five hundred twenty".