28873520 has 40 divisors (see below), whose sum is σ = 72297456. Its totient is φ = 10660608.

The previous prime is 28873519. The next prime is 28873529. The reversal of 28873520 is 2537882.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (28873529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12842 + ... + 14921.

Almost surely, 2^28873520 is an apocalyptic number.

28873520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28873520 is an abundant number, since it is smaller than the sum of its proper divisors (43423936).

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

28873520 is a wasteful number, since it uses less digits than its factorization.

28873520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27789 (or 27783 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28873520 is about 5373.4086016234. The cubic root of 28873520 is about 306.7843803508.

The spelling of 28873520 in words is "twenty-eight million, eight hundred seventy-three thousand, five hundred twenty".