28356553 has 4 divisors (see below), whose sum is σ = 28457748. Its totient is φ = 28255360.

The previous prime is 28356551. The next prime is 28356563. The reversal of 28356553 is 35565382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35565382 = 2 ⋅17782691.

It can be written as a sum of positive squares in 2 ways, for example, as 6901129 + 21455424 = 2627^2 + 4632^2 .

It is a cyclic number.

It is not a de Polignac number, because 28356553 - 2¹ = 28356551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28356551) 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, 50176 + ... + 50737.

It is an arithmetic number, because the mean of its divisors is an integer number (7114437).

Almost surely, 2^28356553 is an apocalyptic number.

It is an amenable number.

28356553 is a deficient number, since it is larger than the sum of its proper divisors (101195).

28356553 is a wasteful number, since it uses less digits than its factorization.

28356553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101194.

The product of its digits is 108000, while the sum is 37.

The square root of 28356553 is about 5325.0871354373. The cubic root of 28356553 is about 304.9423988688.

The spelling of 28356553 in words is "twenty-eight million, three hundred fifty-six thousand, five hundred fifty-three".