28319629 has 4 divisors (see below), whose sum is σ = 30498076. Its totient is φ = 26141184.

The previous prime is 28319623. The next prime is 28319639. The reversal of 28319629 is 92691382.

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 16793604 + 11526025 = 4098^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 28319629 - 2⁹ = 28319117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28319591 and 28319600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28319623) 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, 1089204 + ... + 1089229.

It is an arithmetic number, because the mean of its divisors is an integer number (7624519).

Almost surely, 2^28319629 is an apocalyptic number.

It is an amenable number.

28319629 is a deficient number, since it is larger than the sum of its proper divisors (2178447).

28319629 is a wasteful number, since it uses less digits than its factorization.

28319629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178446.

The product of its digits is 46656, while the sum is 40.

The square root of 28319629 is about 5321.6190205613. The cubic root of 28319629 is about 304.8099828699.

The spelling of 28319629 in words is "twenty-eight million, three hundred nineteen thousand, six hundred twenty-nine".