28086405 has 8 divisors (see below), whose sum is σ = 44938272. Its totient is φ = 14979408.

The previous prime is 28086391. The next prime is 28086433. The reversal of 28086405 is 50468082.

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

It is not a de Polignac number, because 28086405 - 2¹⁰ = 28085381 is a prime.

It is a super-2 number, since 2×28086405² = 1577692291648050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936199 + ... + 936228.

It is an arithmetic number, because the mean of its divisors is an integer number (5617284).

Almost surely, 2^28086405 is an apocalyptic number.

It is an amenable number.

28086405 is a deficient number, since it is larger than the sum of its proper divisors (16851867).

28086405 is a wasteful number, since it uses less digits than its factorization.

28086405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872435.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 28086405 is about 5299.6608382046. The cubic root of 28086405 is about 303.9709293820.

The spelling of 28086405 in words is "twenty-eight million, eighty-six thousand, four hundred five".