28690525 has 6 divisors (see below), whose sum is σ = 35576282. Its totient is φ = 22952400.

The previous prime is 28690523. The next prime is 28690549. The reversal of 28690525 is 52509682.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5861241 + 22829284 = 2421^2 + 4778^2 .

It is not a de Polignac number, because 28690525 - 2¹ = 28690523 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 (28690523) 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, 573786 + ... + 573835.

Almost surely, 2^28690525 is an apocalyptic number.

28690525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28690525 is a deficient number, since it is larger than the sum of its proper divisors (6885757).

28690525 is a wasteful number, since it uses less digits than its factorization.

28690525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147631 (or 1147626 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 28690525 is about 5356.3537037802. The cubic root of 28690525 is about 306.1348921843.

The spelling of 28690525 in words is "twenty-eight million, six hundred ninety thousand, five hundred twenty-five".