28402013 has 4 divisors (see below), whose sum is σ = 28527360. Its totient is φ = 28276668.

The previous prime is 28402007. The next prime is 28402039. The reversal of 28402013 is 31020482.

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 28402013 - 2²² = 24207709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402063) 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, 62333 + ... + 62786.

It is an arithmetic number, because the mean of its divisors is an integer number (7131840).

Almost surely, 2^28402013 is an apocalyptic number.

It is an amenable number.

28402013 is a deficient number, since it is larger than the sum of its proper divisors (125347).

28402013 is a wasteful number, since it uses less digits than its factorization.

28402013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125346.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28402013 is about 5329.3539008026. The cubic root of 28402013 is about 305.1052686886.

Adding to 28402013 its reverse (31020482), we get a palindrome (59422495).

The spelling of 28402013 in words is "twenty-eight million, four hundred two thousand, thirteen".