28297653 has 4 divisors (see below), whose sum is σ = 37730208. Its totient is φ = 18865100.

The previous prime is 28297603. The next prime is 28297657. The reversal of 28297653 is 35679282.

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 28297653 - 2⁶ = 28297589 is a prime.

It is a super-4 number, since 4×28297653⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28297657) 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, 4716273 + ... + 4716278.

It is an arithmetic number, because the mean of its divisors is an integer number (9432552).

Almost surely, 2^28297653 is an apocalyptic number.

It is an amenable number.

28297653 is a deficient number, since it is larger than the sum of its proper divisors (9432555).

28297653 is an equidigital number, since it uses as much as digits as its factorization.

28297653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432554.

The product of its digits is 181440, while the sum is 42.

The square root of 28297653 is about 5319.5538346745. The cubic root of 28297653 is about 304.7311183997.

The spelling of 28297653 in words is "twenty-eight million, two hundred ninety-seven thousand, six hundred fifty-three".