28016031 has 4 divisors (see below), whose sum is σ = 37354712. Its totient is φ = 18677352.

The previous prime is 28016029. The next prime is 28016039. The reversal of 28016031 is 13061082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28016031 - 2¹ = 28016029 is a prime.

It is a super-2 number, since 2×28016031² = 1569795985985922, 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 = 28015989 and 28016007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28016039) 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, 4669336 + ... + 4669341.

It is an arithmetic number, because the mean of its divisors is an integer number (9338678).

Almost surely, 2^28016031 is an apocalyptic number.

28016031 is a deficient number, since it is larger than the sum of its proper divisors (9338681).

28016031 is an equidigital number, since it uses as much as digits as its factorization.

28016031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338680.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 28016031 is about 5293.0171924905. The cubic root of 28016031 is about 303.7168379858.

The spelling of 28016031 in words is "twenty-eight million, sixteen thousand, thirty-one".