28763520 has 128 divisors (see below), whose sum is σ = 93415680. Its totient is φ = 7526400.

The previous prime is 28763489. The next prime is 28763531. The reversal of 28763520 is 2536782.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136215 + ... + 136425.

It is an arithmetic number, because the mean of its divisors is an integer number (729810).

Almost surely, 2^28763520 is an apocalyptic number.

28763520 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 28763520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46707840).

28763520 is an abundant number, since it is smaller than the sum of its proper divisors (64652160).

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

28763520 is a wasteful number, since it uses less digits than its factorization.

28763520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 28763520 is about 5363.1632456974. The cubic root of 28763520 is about 306.3942971259.

The spelling of 28763520 in words is "twenty-eight million, seven hundred sixty-three thousand, five hundred twenty".