28047831 has 8 divisors (see below), whose sum is σ = 42739584. Its totient is φ = 16027320.

The previous prime is 28047829. The next prime is 28047863. The reversal of 28047831 is 13874082.

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

It is not a de Polignac number, because 28047831 - 2¹ = 28047829 is a prime.

It is a super-3 number, since 3×28047831³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 28047792 and 28047801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28047871) 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, 667785 + ... + 667826.

It is an arithmetic number, because the mean of its divisors is an integer number (5342448).

Almost surely, 2^28047831 is an apocalyptic number.

28047831 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28047831 is a deficient number, since it is larger than the sum of its proper divisors (14691753).

28047831 is a wasteful number, since it uses less digits than its factorization.

28047831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335621.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 28047831 is about 5296.0202982995. The cubic root of 28047831 is about 303.8317072610.

The spelling of 28047831 in words is "twenty-eight million, forty-seven thousand, eight hundred thirty-one".