28012925 has 6 divisors (see below), whose sum is σ = 34736058. Its totient is φ = 22410320.

The previous prime is 28012913. The next prime is 28012939. The reversal of 28012925 is 52921082.

It can be written as a sum of positive squares in 3 ways, for example, as 534361 + 27478564 = 731^2 + 5242^2 .

It is not a de Polignac number, because 28012925 - 2¹⁰ = 28011901 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 5 ways as a sum of consecutive naturals, for example, 560234 + ... + 560283.

It is an arithmetic number, because the mean of its divisors is an integer number (5789343).

Almost surely, 2^28012925 is an apocalyptic number.

28012925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28012925 is a deficient number, since it is larger than the sum of its proper divisors (6723133).

28012925 is a wasteful number, since it uses less digits than its factorization.

28012925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120527 (or 1120522 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28012925 is about 5292.7237789252. The cubic root of 28012925 is about 303.7056137054.

The spelling of 28012925 in words is "twenty-eight million, twelve thousand, nine hundred twenty-five".