28361929 has 4 divisors (see below), whose sum is σ = 28509076. Its totient is φ = 28214784.

The previous prime is 28361923. The next prime is 28361941. The reversal of 28361929 is 92916382.

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 2839225 + 25522704 = 1685^2 + 5052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28361929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28361891 and 28361900.

It is not an unprimeable number, because it can be changed into a prime (28361923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73284 + ... + 73669.

It is an arithmetic number, because the mean of its divisors is an integer number (7127269).

Almost surely, 2^28361929 is an apocalyptic number.

It is an amenable number.

28361929 is a deficient number, since it is larger than the sum of its proper divisors (147147).

28361929 is a wasteful number, since it uses less digits than its factorization.

28361929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147146.

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

The square root of 28361929 is about 5325.5918919872. The cubic root of 28361929 is about 304.9616685681.

The spelling of 28361929 in words is "twenty-eight million, three hundred sixty-one thousand, nine hundred twenty-nine".