28851013 has 2 divisors, whose sum is σ = 28851014. Its totient is φ = 28851012.

The previous prime is 28850999. The next prime is 28851029. The reversal of 28851013 is 31015882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22591009 + 6260004 = 4753^2 + 2502^2 .

It is a cyclic number.

It is not a de Polignac number, because 28851013 - 2⁹ = 28850501 is a prime.

It is a super-2 number, since 2×28851013² = 1664761902252338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28851073) 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 as a sum of consecutive naturals, namely, 14425506 + 14425507.

It is an arithmetic number, because the mean of its divisors is an integer number (14425507).

Almost surely, 2^28851013 is an apocalyptic number.

It is an amenable number.

28851013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28851013 is an equidigital number, since it uses as much as digits as its factorization.

28851013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28851013 is about 5371.3138988519. The cubic root of 28851013 is about 306.7046464986.

Adding to 28851013 its reverse (31015882), we get a palindrome (59866895).

The spelling of 28851013 in words is "twenty-eight million, eight hundred fifty-one thousand, thirteen".