28235278 has 4 divisors (see below), whose sum is σ = 42352920. Its totient is φ = 14117638.

The previous prime is 28235269. The next prime is 28235279. The reversal of 28235278 is 87253282.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28235279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7058818 + ... + 7058821.

It is an arithmetic number, because the mean of its divisors is an integer number (10588230).

Almost surely, 2^28235278 is an apocalyptic number.

28235278 is a deficient number, since it is larger than the sum of its proper divisors (14117642).

28235278 is a wasteful number, since it uses less digits than its factorization.

28235278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14117641.

The product of its digits is 53760, while the sum is 37.

The square root of 28235278 is about 5313.6877966249. The cubic root of 28235278 is about 304.5070528626.

The spelling of 28235278 in words is "twenty-eight million, two hundred thirty-five thousand, two hundred seventy-eight".