28907520 has 96 divisors (see below), whose sum is σ = 92579760. Its totient is φ = 7700480.

The previous prime is 28907509. The next prime is 28907521. The reversal of 28907520 is 2570982.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28907521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30250 + ... + 31190.

Almost surely, 2^28907520 is an apocalyptic number.

28907520 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 28907520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46289880).

28907520 is an abundant number, since it is smaller than the sum of its proper divisors (63672240).

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

28907520 is an equidigital number, since it uses as much as digits as its factorization.

28907520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 951 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 28907520 is about 5376.5713982054. The cubic root of 28907520 is about 306.9047510503.

The spelling of 28907520 in words is "twenty-eight million, nine hundred seven thousand, five hundred twenty".