28697633 has 4 divisors (see below), whose sum is σ = 29168148. Its totient is φ = 28227120.

The previous prime is 28697623. The next prime is 28697651. The reversal of 28697633 is 33679682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13890529 + 14807104 = 3727^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 28697633 - 2⁶ = 28697569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28697623) 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, 235166 + ... + 235287.

It is an arithmetic number, because the mean of its divisors is an integer number (7292037).

Almost surely, 2^28697633 is an apocalyptic number.

It is an amenable number.

28697633 is a deficient number, since it is larger than the sum of its proper divisors (470515).

28697633 is an equidigital number, since it uses as much as digits as its factorization.

28697633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470514.

The product of its digits is 326592, while the sum is 44.

The square root of 28697633 is about 5357.0171737638. The cubic root of 28697633 is about 306.1601714607.

The spelling of 28697633 in words is "twenty-eight million, six hundred ninety-seven thousand, six hundred thirty-three".