28901520 has 120 divisors (see below), whose sum is σ = 98103096. Its totient is φ = 7624704.

The previous prime is 28901507. The next prime is 28901531. The reversal of 28901520 is 2510982.

It can be written as a sum of positive squares in 4 ways, for example, as 10342656 + 18558864 = 3216^2 + 4308^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98494 + ... + 98786.

Almost surely, 2^28901520 is an apocalyptic number.

28901520 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 28901520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49051548).

28901520 is an abundant number, since it is smaller than the sum of its proper divisors (69201576).

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

28901520 is a wasteful number, since it uses less digits than its factorization.

28901520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 28901520 is about 5376.0133928405. The cubic root of 28901520 is about 306.8835160231.

The spelling of 28901520 in words is "twenty-eight million, nine hundred one thousand, five hundred twenty".