28019653 has 4 divisors (see below), whose sum is σ = 28414368. Its totient is φ = 27624940.

The previous prime is 28019647. The next prime is 28019659. The reversal of 28019653 is 35691082.

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 an interprime number because it is at equal distance from previous prime (28019647) and next prime (28019659).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28019653 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 (28019659) 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, 197251 + ... + 197392.

It is an arithmetic number, because the mean of its divisors is an integer number (7103592).

Almost surely, 2^28019653 is an apocalyptic number.

It is an amenable number.

28019653 is a deficient number, since it is larger than the sum of its proper divisors (394715).

28019653 is an equidigital number, since it uses as much as digits as its factorization.

28019653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394714.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28019653 is about 5293.3593303308. The cubic root of 28019653 is about 303.7299259090.

The spelling of 28019653 in words is "twenty-eight million, nineteen thousand, six hundred fifty-three".