28006605 has 48 divisors (see below), whose sum is σ = 54812160. Its totient is φ = 13104000.

The previous prime is 28006597. The next prime is 28006613. The reversal of 28006605 is 50660082.

It is an interprime number because it is at equal distance from previous prime (28006597) and next prime (28006613).

It is not a de Polignac number, because 28006605 - 2³ = 28006597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13380 + ... + 15330.

It is an arithmetic number, because the mean of its divisors is an integer number (1141920).

Almost surely, 2^28006605 is an apocalyptic number.

It is an amenable number.

28006605 is a deficient number, since it is larger than the sum of its proper divisors (26805555).

28006605 is a wasteful number, since it uses less digits than its factorization.

28006605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002 (or 1999 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28006605 is about 5292.1266991636. The cubic root of 28006605 is about 303.6827722986.

Adding to 28006605 its reverse (50660082), we get a palindrome (78666687).

The spelling of 28006605 in words is "twenty-eight million, six thousand, six hundred five".