28449893 has 2 divisors, whose sum is σ = 28449894. Its totient is φ = 28449892.

The previous prime is 28449887. The next prime is 28449907. The reversal of 28449893 is 39894482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26646244 + 1803649 = 5162^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 28449893 - 2¹⁰ = 28448869 is a prime.

It is a super-2 number, since 2×28449893² = 1618792823422898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28449803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224946 + 14224947.

It is an arithmetic number, because the mean of its divisors is an integer number (14224947).

Almost surely, 2^28449893 is an apocalyptic number.

It is an amenable number.

28449893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28449893 is an equidigital number, since it uses as much as digits as its factorization.

28449893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 28449893 is about 5333.8441109579. The cubic root of 28449893 is about 305.2766208505.

The spelling of 28449893 in words is "twenty-eight million, four hundred forty-nine thousand, eight hundred ninety-three".