28261025 has 18 divisors (see below), whose sum is σ = 37952370. Its totient is φ = 20866560.

The previous prime is 28261003. The next prime is 28261027. The reversal of 28261025 is 52016282.

It can be written as a sum of positive squares in 9 ways, for example, as 12902464 + 15358561 = 3592^2 + 3919^2 .

It is not a de Polignac number, because 28261025 - 2¹⁴ = 28244641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28260985 and 28261003.

It is not an unprimeable number, because it can be changed into a prime (28261027) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 881 + ... + 7569.

It is an arithmetic number, because the mean of its divisors is an integer number (2108465).

Almost surely, 2^28261025 is an apocalyptic number.

28261025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28261025 is a deficient number, since it is larger than the sum of its proper divisors (9691345).

28261025 is a wasteful number, since it uses less digits than its factorization.

28261025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6725 (or 6707 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28261025 is about 5316.1099499540. The cubic root of 28261025 is about 304.5995820410.

The spelling of 28261025 in words is "twenty-eight million, two hundred sixty-one thousand, twenty-five".