28072235 has 4 divisors (see below), whose sum is σ = 33686688. Its totient is φ = 22457784.

The previous prime is 28072211. The next prime is 28072241. The reversal of 28072235 is 53227082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28072235 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28072198 and 28072207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2807219 + ... + 2807228.

It is an arithmetic number, because the mean of its divisors is an integer number (8421672).

Almost surely, 2^28072235 is an apocalyptic number.

28072235 is a deficient number, since it is larger than the sum of its proper divisors (5614453).

28072235 is an equidigital number, since it uses as much as digits as its factorization.

28072235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5614452.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28072235 is about 5298.3237915401. The cubic root of 28072235 is about 303.9198015305.

The spelling of 28072235 in words is "twenty-eight million, seventy-two thousand, two hundred thirty-five".