28881525 has 12 divisors (see below), whose sum is σ = 47750912. Its totient is φ = 15403440.

The previous prime is 28881499. The next prime is 28881527. The reversal of 28881525 is 52518882.

28881525 = T₃₉₀ + T₃₉₁ + ... + T₆₁₄.

It is not a de Polignac number, because 28881525 - 2⁵ = 28881493 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192469 + ... + 192618.

Almost surely, 2^28881525 is an apocalyptic number.

28881525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28881525 is a deficient number, since it is larger than the sum of its proper divisors (18869387).

28881525 is a wasteful number, since it uses less digits than its factorization.

28881525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385100 (or 385095 counting only the distinct ones).

The product of its digits is 51200, while the sum is 39.

The square root of 28881525 is about 5374.1534217028. The cubic root of 28881525 is about 306.8127290713.

The spelling of 28881525 in words is "twenty-eight million, eight hundred eighty-one thousand, five hundred twenty-five".