28538525 has 6 divisors (see below), whose sum is σ = 35387802. Its totient is φ = 22830800.

The previous prime is 28538491. The next prime is 28538527. The reversal of 28538525 is 52583582.

It can be written as a sum of positive squares in 3 ways, for example, as 6061444 + 22477081 = 2462^2 + 4741^2 .

It is not a de Polignac number, because 28538525 - 2¹⁶ = 28472989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28538527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 570746 + ... + 570795.

It is an arithmetic number, because the mean of its divisors is an integer number (5897967).

Almost surely, 2^28538525 is an apocalyptic number.

28538525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28538525 is a deficient number, since it is larger than the sum of its proper divisors (6849277).

28538525 is a wasteful number, since it uses less digits than its factorization.

28538525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141551 (or 1141546 counting only the distinct ones).

The product of its digits is 96000, while the sum is 38.

The square root of 28538525 is about 5342.1461043292. The cubic root of 28538525 is about 305.5933089562.

It can be divided in two parts, 2853 and 8525, that multiplied together give a triangular number (24321825 = T₆₉₇₄).

The spelling of 28538525 in words is "twenty-eight million, five hundred thirty-eight thousand, five hundred twenty-five".