28621235 has 4 divisors (see below), whose sum is σ = 34345488. Its totient is φ = 22896984.

The previous prime is 28621213. The next prime is 28621237. The reversal of 28621235 is 53212682.

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

It is a cyclic number.

It is not a de Polignac number, because 28621235 - 2⁶ = 28621171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28621198 and 28621207.

It is not an unprimeable number, because it can be changed into a prime (28621237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862119 + ... + 2862128.

It is an arithmetic number, because the mean of its divisors is an integer number (8586372).

Almost surely, 2^28621235 is an apocalyptic number.

28621235 is a deficient number, since it is larger than the sum of its proper divisors (5724253).

28621235 is an equidigital number, since it uses as much as digits as its factorization.

28621235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724252.

The product of its digits is 5760, while the sum is 29.

The square root of 28621235 is about 5349.8817743946. The cubic root of 28621235 is about 305.8882464602. Note that the first 3 decimals are identical.

The spelling of 28621235 in words is "twenty-eight million, six hundred twenty-one thousand, two hundred thirty-five".