28553869 has 2 divisors, whose sum is σ = 28553870. Its totient is φ = 28553868.

The previous prime is 28553867. The next prime is 28553881. The reversal of 28553869 is 96835582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22610025 + 5943844 = 4755^2 + 2438^2 .

It is a cyclic number.

It is not a de Polignac number, because 28553869 - 2¹ = 28553867 is a prime.

It is a super-2 number, since 2×28553869² = 1630646869738322, which contains 22 as substring.

Together with 28553867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28553867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14276934 + 14276935.

It is an arithmetic number, because the mean of its divisors is an integer number (14276935).

Almost surely, 2^28553869 is an apocalyptic number.

It is an amenable number.

28553869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28553869 is an equidigital number, since it uses as much as digits as its factorization.

28553869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The square root of 28553869 is about 5343.5820382960. The cubic root of 28553869 is about 305.6480674930.

It can be divided in two parts, 2855 and 3869, that added together give a square (6724 = 82²).

The spelling of 28553869 in words is "twenty-eight million, five hundred fifty-three thousand, eight hundred sixty-nine".