28290075 has 48 divisors (see below), whose sum is σ = 52068096. Its totient is φ = 13436800.

The previous prime is 28290061. The next prime is 28290103. The reversal of 28290075 is 57009282.

It is not a de Polignac number, because 28290075 - 2¹⁸ = 28027931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43402 + ... + 44048.

It is an arithmetic number, because the mean of its divisors is an integer number (1084752).

Almost surely, 2^28290075 is an apocalyptic number.

28290075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28290075 is a deficient number, since it is larger than the sum of its proper divisors (23778021).

28290075 is a wasteful number, since it uses less digits than its factorization.

28290075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 28290075 is about 5318.8415092010. The cubic root of 28290075 is about 304.7039140401.

The spelling of 28290075 in words is "twenty-eight million, two hundred ninety thousand, seventy-five".