28651191 has 4 divisors (see below), whose sum is σ = 38201592. Its totient is φ = 19100792.

The previous prime is 28651157. The next prime is 28651199. The reversal of 28651191 is 19115682.

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

It is a cyclic number.

It is not a de Polignac number, because 28651191 - 2¹⁷ = 28520119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28651199) 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, 4775196 + ... + 4775201.

It is an arithmetic number, because the mean of its divisors is an integer number (9550398).

Almost surely, 2^28651191 is an apocalyptic number.

28651191 is a deficient number, since it is larger than the sum of its proper divisors (9550401).

28651191 is an equidigital number, since it uses as much as digits as its factorization.

28651191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9550400.

The product of its digits is 4320, while the sum is 33.

The square root of 28651191 is about 5352.6807302510. The cubic root of 28651191 is about 305.9949270807.

The spelling of 28651191 in words is "twenty-eight million, six hundred fifty-one thousand, one hundred ninety-one".