28331629 has 4 divisors (see below), whose sum is σ = 28384540. Its totient is φ = 28278720.

The previous prime is 28331621. The next prime is 28331669. The reversal of 28331629 is 92613382.

It is a happy number.

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 15920100 + 12411529 = 3990^2 + 3523^2 .

It is a cyclic number.

It is not a de Polignac number, because 28331629 - 2³ = 28331621 is a prime.

It is a pancake number, because a pancake can be divided into 28331629 parts by 7527 straight cuts.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28331594 and 28331603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331621) by changing a digit.

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, 25644 + ... + 26725.

It is an arithmetic number, because the mean of its divisors is an integer number (7096135).

Almost surely, 2^28331629 is an apocalyptic number.

It is an amenable number.

28331629 is a deficient number, since it is larger than the sum of its proper divisors (52911).

28331629 is an equidigital number, since it uses as much as digits as its factorization.

28331629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52910.

The product of its digits is 15552, while the sum is 34.

The square root of 28331629 is about 5322.7463775761. The cubic root of 28331629 is about 304.8530296118.

The spelling of 28331629 in words is "twenty-eight million, three hundred thirty-one thousand, six hundred twenty-nine".