28155653 has 4 divisors (see below), whose sum is σ = 28190688. Its totient is φ = 28120620.

The previous prime is 28155649. The next prime is 28155671. The reversal of 28155653 is 35655182.

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.

It is a cyclic number.

It is not a de Polignac number, because 28155653 - 2² = 28155649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155613) 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, 16283 + ... + 17928.

It is an arithmetic number, because the mean of its divisors is an integer number (7047672).

Almost surely, 2^28155653 is an apocalyptic number.

It is an amenable number.

28155653 is a deficient number, since it is larger than the sum of its proper divisors (35035).

28155653 is an equidigital number, since it uses as much as digits as its factorization.

28155653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35034.

The product of its digits is 36000, while the sum is 35.

The square root of 28155653 is about 5306.1900644436. The cubic root of 28155653 is about 304.2205412879.

The spelling of 28155653 in words is "twenty-eight million, one hundred fifty-five thousand, six hundred fifty-three".