28102725 has 54 divisors (see below), whose sum is σ = 58576050. Its totient is φ = 12841920.

The previous prime is 28102661. The next prime is 28102727. The reversal of 28102725 is 52720182.

It can be written as a sum of positive squares in 3 ways, for example, as 6563844 + 21538881 = 2562^2 + 4641^2 .

It is not a de Polignac number, because 28102725 - 2⁶ = 28102661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 9751 + ... + 12299.

Almost surely, 2^28102725 is an apocalyptic number.

28102725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28102725 is an abundant number, since it is smaller than the sum of its proper divisors (30473325).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28102725 is a wasteful number, since it uses less digits than its factorization.

28102725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28102725 is about 5301.2003357730. The cubic root of 28102725 is about 304.0297935077.

The spelling of 28102725 in words is "twenty-eight million, one hundred two thousand, seven hundred twenty-five".