28252251 has 12 divisors (see below), whose sum is σ = 41081040. Its totient is φ = 18709200.

The previous prime is 28252243. The next prime is 28252261. The reversal of 28252251 is 15225282.

It is not a de Polignac number, because 28252251 - 2³ = 28252243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28252261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9036 + ... + 11753.

It is an arithmetic number, because the mean of its divisors is an integer number (3423420).

Almost surely, 2^28252251 is an apocalyptic number.

28252251 is a deficient number, since it is larger than the sum of its proper divisors (12828789).

28252251 is a wasteful number, since it uses less digits than its factorization.

28252251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20946 (or 20943 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 28252251 is about 5315.2846584167. The cubic root of 28252251 is about 304.5680564876.

The spelling of 28252251 in words is "twenty-eight million, two hundred fifty-two thousand, two hundred fifty-one".