28874591 has 8 divisors (see below), whose sum is σ = 30772224. Its totient is φ = 27030520.

The previous prime is 28874567. The next prime is 28874597. The reversal of 28874591 is 19547882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28874591 - 2¹⁸ = 28612447 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 (28874597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12275 + ... + 14436.

It is an arithmetic number, because the mean of its divisors is an integer number (3846528).

Almost surely, 2^28874591 is an apocalyptic number.

28874591 is a deficient number, since it is larger than the sum of its proper divisors (1897633).

28874591 is a wasteful number, since it uses less digits than its factorization.

28874591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26781.

The product of its digits is 161280, while the sum is 44.

The square root of 28874591 is about 5373.5082581122. The cubic root of 28874591 is about 306.7881734688.

The spelling of 28874591 in words is "twenty-eight million, eight hundred seventy-four thousand, five hundred ninety-one".