28113031 has 4 divisors (see below), whose sum is σ = 28124392. Its totient is φ = 28101672.

The previous prime is 28113011. The next prime is 28113037. The reversal of 28113031 is 13031182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28113031 - 2¹¹ = 28110983 is a prime.

It is a super-2 number, since 2×28113031² = 1580685024013922, which contains 22 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 (28113037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216 + ... + 7501.

It is an arithmetic number, because the mean of its divisors is an integer number (7031098).

Almost surely, 2^28113031 is an apocalyptic number.

28113031 is a deficient number, since it is larger than the sum of its proper divisors (11361).

28113031 is an equidigital number, since it uses as much as digits as its factorization.

28113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11360.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 28113031 is about 5302.1722906748. The cubic root of 28113031 is about 304.0669541758.

The spelling of 28113031 in words is "twenty-eight million, one hundred thirteen thousand, thirty-one".