28272861 has 16 divisors (see below), whose sum is σ = 42513600. Its totient is φ = 18566064.

The previous prime is 28272851. The next prime is 28272869. The reversal of 28272861 is 16827282.

It is a happy number.

It is not a de Polignac number, because 28272861 - 2¹³ = 28264669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28272869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6006 + ... + 9623.

It is an arithmetic number, because the mean of its divisors is an integer number (2657100).

Almost surely, 2^28272861 is an apocalyptic number.

It is an amenable number.

28272861 is a deficient number, since it is larger than the sum of its proper divisors (14240739).

28272861 is a wasteful number, since it uses less digits than its factorization.

28272861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15705 (or 15699 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28272861 is about 5317.2230534368. The cubic root of 28272861 is about 304.6420992234.

The spelling of 28272861 in words is "twenty-eight million, two hundred seventy-two thousand, eight hundred sixty-one".