28571605 has 4 divisors (see below), whose sum is σ = 34285932. Its totient is φ = 22857280.

The previous prime is 28571593. The next prime is 28571623. The reversal of 28571605 is 50617582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17859076 + 10712529 = 4226^2 + 3273^2 .

It is not a de Polignac number, because 28571605 - 2¹¹ = 28569557 is a prime.

It is a super-2 number, since 2×28571605² = 1632673224552050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2857156 + ... + 2857165.

It is an arithmetic number, because the mean of its divisors is an integer number (8571483).

Almost surely, 2^28571605 is an apocalyptic number.

It is an amenable number.

28571605 is a deficient number, since it is larger than the sum of its proper divisors (5714327).

28571605 is an equidigital number, since it uses as much as digits as its factorization.

28571605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714326.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 28571605 is about 5345.2413416047. The cubic root of 28571605 is about 305.7113379861.

The spelling of 28571605 in words is "twenty-eight million, five hundred seventy-one thousand, six hundred five".