28609371 has 24 divisors (see below), whose sum is σ = 47455200. Its totient is φ = 16269696.

The previous prime is 28609369. The next prime is 28609381. The reversal of 28609371 is 17390682.

28609371 is a `hidden beast` number, since 286 + 0 + 9 + 371 = 666.

It is not a de Polignac number, because 28609371 - 2¹ = 28609369 is a prime.

It is a super-2 number, since 2×28609371² = 1636992218031282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28609331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13705 + ... + 15653.

It is an arithmetic number, because the mean of its divisors is an integer number (1977300).

Almost surely, 2^28609371 is an apocalyptic number.

28609371 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28609371 is a deficient number, since it is larger than the sum of its proper divisors (18845829).

28609371 is a wasteful number, since it uses less digits than its factorization.

28609371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195 (or 2192 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28609371 is about 5348.7728499161. The cubic root of 28609371 is about 305.8459752851.

The spelling of 28609371 in words is "twenty-eight million, six hundred nine thousand, three hundred seventy-one".