28901525 has 12 divisors (see below), whose sum is σ = 35907300. Its totient is φ = 23076480.

The previous prime is 28901507. The next prime is 28901531. The reversal of 28901525 is 52510982.

It can be written as a sum of positive squares in 6 ways, for example, as 1002001 + 27899524 = 1001^2 + 5282^2 .

It is not a de Polignac number, because 28901525 - 2¹⁴ = 28885141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28901491 and 28901500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19511 + ... + 20939.

It is an arithmetic number, because the mean of its divisors is an integer number (2992275).

Almost surely, 2^28901525 is an apocalyptic number.

28901525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28901525 is a deficient number, since it is larger than the sum of its proper divisors (7005775).

28901525 is a wasteful number, since it uses less digits than its factorization.

28901525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248 (or 2243 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 28901525 is about 5376.0138578690. The cubic root of 28901525 is about 306.8835337202.

The spelling of 28901525 in words is "twenty-eight million, nine hundred one thousand, five hundred twenty-five".