28133031 has 8 divisors (see below), whose sum is σ = 37705840. Its totient is φ = 18657792.

The previous prime is 28133023. The next prime is 28133033. The reversal of 28133031 is 13033182.

It is a happy number.

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

It is not a de Polignac number, because 28133031 - 2³ = 28133023 is a prime.

It is a super-2 number, since 2×28133031² = 1582934866493922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28132989 and 28133007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28133033) 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, 23716 + ... + 24873.

It is an arithmetic number, because the mean of its divisors is an integer number (4713230).

Almost surely, 2^28133031 is an apocalyptic number.

28133031 is a deficient number, since it is larger than the sum of its proper divisors (9572809).

28133031 is a wasteful number, since it uses less digits than its factorization.

28133031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48785.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 28133031 is about 5304.0579747963. The cubic root of 28133031 is about 304.1390428991.

The spelling of 28133031 in words is "twenty-eight million, one hundred thirty-three thousand, thirty-one".