28752525 has 36 divisors (see below), whose sum is σ = 54535572. Its totient is φ = 14430720.

The previous prime is 28752523. The next prime is 28752541. The reversal of 28752525 is 52525782.

28752525 is a `hidden beast` number, since 2 + 87 + 52 + 525 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 2064969 + 26687556 = 1437^2 + 5166^2 .

It is not a de Polignac number, because 28752525 - 2¹ = 28752523 is a prime.

It is a super-4 number, since 4×28752525⁴ (a number of 31 digits) contains 4444 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28752525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28752523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 67 + ... + 7583.

It is an arithmetic number, because the mean of its divisors is an integer number (1514877).

Almost surely, 2^28752525 is an apocalyptic number.

28752525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28752525 is a deficient number, since it is larger than the sum of its proper divisors (25783047).

28752525 is a wasteful number, since it uses less digits than its factorization.

28752525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7550 (or 7542 counting only the distinct ones).

The product of its digits is 56000, while the sum is 36.

The square root of 28752525 is about 5362.1380996763. The cubic root of 28752525 is about 306.3552518973.

The spelling of 28752525 in words is "twenty-eight million, seven hundred fifty-two thousand, five hundred twenty-five".