28401013 has 2 divisors, whose sum is σ = 28401014. Its totient is φ = 28401012.

The previous prime is 28400971. The next prime is 28401017. The reversal of 28401013 is 31010482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19201924 + 9199089 = 4382^2 + 3033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28401013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28401017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200506 + 14200507.

It is an arithmetic number, because the mean of its divisors is an integer number (14200507).

Almost surely, 2^28401013 is an apocalyptic number.

It is an amenable number.

28401013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28401013 is an equidigital number, since it uses as much as digits as its factorization.

28401013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28401013 is about 5329.2600799736. The cubic root of 28401013 is about 305.1016878526.

Adding to 28401013 its reverse (31010482), we get a palindrome (59411495).

The spelling of 28401013 in words is "twenty-eight million, four hundred one thousand, thirteen".