28207861 has 8 divisors (see below), whose sum is σ = 31765248. Its totient is φ = 24816000.

The previous prime is 28207853. The next prime is 28207901. The reversal of 28207861 is 16870282.

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

It is not a de Polignac number, because 28207861 - 2³ = 28207853 is a prime.

It is a super-3 number, since 3×28207861³ (a number of 23 digits) contains 333 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 (28207261) 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, 41020 + ... + 41701.

It is an arithmetic number, because the mean of its divisors is an integer number (3970656).

Almost surely, 2^28207861 is an apocalyptic number.

It is an amenable number.

28207861 is a deficient number, since it is larger than the sum of its proper divisors (3557387).

28207861 is a wasteful number, since it uses less digits than its factorization.

28207861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82763.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 28207861 is about 5311.1073233366. The cubic root of 28207861 is about 304.4084602017.

The spelling of 28207861 in words is "twenty-eight million, two hundred seven thousand, eight hundred sixty-one".