28107553 has 4 divisors (see below), whose sum is σ = 28286740. Its totient is φ = 27928368.

The previous prime is 28107533. The next prime is 28107559. The reversal of 28107553 is 35570182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21095649 + 7011904 = 4593^2 + 2648^2 .

It is a cyclic number.

It is not a de Polignac number, because 28107553 - 2⁹ = 28107041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28107559) 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, 89358 + ... + 89671.

It is an arithmetic number, because the mean of its divisors is an integer number (7071685).

Almost surely, 2^28107553 is an apocalyptic number.

It is an amenable number.

28107553 is a deficient number, since it is larger than the sum of its proper divisors (179187).

28107553 is a wasteful number, since it uses less digits than its factorization.

28107553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179186.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 28107553 is about 5301.6556847838. The cubic root of 28107553 is about 304.0472031100.

The spelling of 28107553 in words is "twenty-eight million, one hundred seven thousand, five hundred fifty-three".