28434919 has 8 divisors (see below), whose sum is σ = 28840448. Its totient is φ = 28032480.

The previous prime is 28434899. The next prime is 28434947. The reversal of 28434919 is 91943482.

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

It is a cyclic number.

It is not a de Polignac number, because 28434919 - 2⁹ = 28434407 is a prime.

It is a super-2 number, since 2×28434919² = 1617089237073122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28434979) 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, 22369 + ... + 23605.

It is an arithmetic number, because the mean of its divisors is an integer number (3605056).

Almost surely, 2^28434919 is an apocalyptic number.

28434919 is a deficient number, since it is larger than the sum of its proper divisors (405529).

28434919 is a wasteful number, since it uses less digits than its factorization.

28434919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545.

The product of its digits is 62208, while the sum is 40.

The square root of 28434919 is about 5332.4402481416. The cubic root of 28434919 is about 305.2230528185.

The spelling of 28434919 in words is "twenty-eight million, four hundred thirty-four thousand, nine hundred nineteen".