28125099 has 24 divisors (see below), whose sum is σ = 42316560. Its totient is φ = 17978688.

The previous prime is 28125079. The next prime is 28125103. The reversal of 28125099 is 99052182.

It is not a de Polignac number, because 28125099 - 2⁹ = 28124587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28125079) 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, 51144 + ... + 51690.

It is an arithmetic number, because the mean of its divisors is an integer number (1763190).

Almost surely, 2^28125099 is an apocalyptic number.

28125099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28125099 is a deficient number, since it is larger than the sum of its proper divisors (14191461).

28125099 is a wasteful number, since it uses less digits than its factorization.

28125099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 28125099 is about 5303.3101927004. The cubic root of 28125099 is about 304.1104566008.

The spelling of 28125099 in words is "twenty-eight million, one hundred twenty-five thousand, ninety-nine".