28061525 has 12 divisors (see below), whose sum is σ = 35368644. Its totient is φ = 22080000.

The previous prime is 28061519. The next prime is 28061557. The reversal of 28061525 is 52516082.

It can be written as a sum of positive squares in 6 ways, for example, as 5726449 + 22335076 = 2393^2 + 4726^2 .

It is not a de Polignac number, because 28061525 - 2¹⁴ = 28045141 is a prime.

It is a Duffinian number.

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, 7676 + ... + 10725.

It is an arithmetic number, because the mean of its divisors is an integer number (2947387).

Almost surely, 2^28061525 is an apocalyptic number.

28061525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28061525 is a deficient number, since it is larger than the sum of its proper divisors (7307119).

28061525 is a wasteful number, since it uses less digits than its factorization.

28061525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18472 (or 18467 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 28061525 is about 5297.3129981152. The cubic root of 28061525 is about 303.8811465498.

The spelling of 28061525 in words is "twenty-eight million, sixty-one thousand, five hundred twenty-five".