28553969 has 4 divisors (see below), whose sum is σ = 28831296. Its totient is φ = 28276644.

The previous prime is 28553963. The next prime is 28553977. The reversal of 28553969 is 96935582.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96935582 = 2 ⋅48467791.

It is a cyclic number.

It is not a de Polignac number, because 28553969 - 2²⁴ = 11776753 is a prime.

It is a super-2 number, since 2×28553969² = 1630658291305922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28553963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138509 + ... + 138714.

It is an arithmetic number, because the mean of its divisors is an integer number (7207824).

Almost surely, 2^28553969 is an apocalyptic number.

It is an amenable number.

28553969 is a deficient number, since it is larger than the sum of its proper divisors (277327).

28553969 is a wasteful number, since it uses less digits than its factorization.

28553969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277326.

The product of its digits is 583200, while the sum is 47.

The square root of 28553969 is about 5343.5913953071. The cubic root of 28553969 is about 305.6484243013.

The spelling of 28553969 in words is "twenty-eight million, five hundred fifty-three thousand, nine hundred sixty-nine".