28190953493 has 4 divisors (see below), whose sum is σ = 28588009248. Its totient is φ = 27793897740.

The previous prime is 28190953481. The next prime is 28190953501. The reversal of 28190953493 is 39435909182.

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 a de Polignac number, because none of the positive numbers 2^k-28190953493 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 (28190953423) 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, 198527771 + ... + 198527912.

It is an arithmetic number, because the mean of its divisors is an integer number (7147002312).

Almost surely, 2^28190953493 is an apocalyptic number.

It is an amenable number.

28190953493 is a deficient number, since it is larger than the sum of its proper divisors (397055755).

28190953493 is an equidigital number, since it uses as much as digits as its factorization.

28190953493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397055754.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 28190953493 in words is "twenty-eight billion, one hundred ninety million, nine hundred fifty-three thousand, four hundred ninety-three".