28667919 has 8 divisors (see below), whose sum is σ = 43684480. Its totient is φ = 16381656.

The previous prime is 28667917. The next prime is 28667929. The reversal of 28667919 is 91976682.

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

It is not a de Polignac number, because 28667919 - 2¹ = 28667917 is a prime.

It is a super-2 number, since 2×28667919² = 1643699159581122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682549 + ... + 682590.

It is an arithmetic number, because the mean of its divisors is an integer number (5460560).

Almost surely, 2^28667919 is an apocalyptic number.

28667919 is a deficient number, since it is larger than the sum of its proper divisors (15016561).

28667919 is a wasteful number, since it uses less digits than its factorization.

28667919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365149.

The product of its digits is 326592, while the sum is 48.

The square root of 28667919 is about 5354.2430837608. The cubic root of 28667919 is about 306.0544672150.

The spelling of 28667919 in words is "twenty-eight million, six hundred sixty-seven thousand, nine hundred nineteen".