28515249 has 24 divisors (see below), whose sum is σ = 47279232. Its totient is φ = 16223040.

The previous prime is 28515247. The next prime is 28515251. The reversal of 28515249 is 94251582.

It is an interprime number because it is at equal distance from previous prime (28515247) and next prime (28515251).

It is not a de Polignac number, because 28515249 - 2¹ = 28515247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28515247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15709 + ... + 17429.

It is an arithmetic number, because the mean of its divisors is an integer number (1969968).

Almost surely, 2^28515249 is an apocalyptic number.

It is an amenable number.

28515249 is a deficient number, since it is larger than the sum of its proper divisors (18763983).

28515249 is a wasteful number, since it uses less digits than its factorization.

28515249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997 (or 1994 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 28515249 is about 5339.9671347303. The cubic root of 28515249 is about 305.5102057998.

It can be divided in two parts, 2851 and 5249, that added together give a square (8100 = 90²).

The spelling of 28515249 in words is "twenty-eight million, five hundred fifteen thousand, two hundred forty-nine".