28409633 has 4 divisors (see below), whose sum is σ = 32468160. Its totient is φ = 24351108.

The previous prime is 28409611. The next prime is 28409639. The reversal of 28409633 is 33690482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28409633 - 2⁶ = 28409569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28409593 and 28409602.

It is not an unprimeable number, because it can be changed into a prime (28409639) 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, 2029253 + ... + 2029266.

It is an arithmetic number, because the mean of its divisors is an integer number (8117040).

Almost surely, 2^28409633 is an apocalyptic number.

It is an amenable number.

28409633 is a deficient number, since it is larger than the sum of its proper divisors (4058527).

28409633 is an equidigital number, since it uses as much as digits as its factorization.

28409633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058526.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 28409633 is about 5330.0687612825. The cubic root of 28409633 is about 305.1325518986.

The spelling of 28409633 in words is "twenty-eight million, four hundred nine thousand, six hundred thirty-three".