28474930191 has 4 divisors (see below), whose sum is σ = 37966573592. Its totient is φ = 18983286792.

The previous prime is 28474930177. The next prime is 28474930217. The reversal of 28474930191 is 19103947482.

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

It is not a de Polignac number, because 28474930191 - 2¹¹ = 28474928143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28474930191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28474930291) 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, 4745821696 + ... + 4745821701.

It is an arithmetic number, because the mean of its divisors is an integer number (9491643398).

Almost surely, 2^28474930191 is an apocalyptic number.

28474930191 is a deficient number, since it is larger than the sum of its proper divisors (9491643401).

28474930191 is an equidigital number, since it uses as much as digits as its factorization.

28474930191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491643400.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 28474930191 in words is "twenty-eight billion, four hundred seventy-four million, nine hundred thirty thousand, one hundred ninety-one".