28015031 has 16 divisors (see below), whose sum is σ = 33242400. Its totient is φ = 23316480.

The previous prime is 28015027. The next prime is 28015051. The reversal of 28015031 is 13051082.

It is not a de Polignac number, because 28015031 - 2² = 28015027 is a prime.

It is a super-2 number, since 2×28015031² = 1569683923861922, 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 = 28014994 and 28015012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28015051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4895 + ... + 8943.

It is an arithmetic number, because the mean of its divisors is an integer number (2077650).

Almost surely, 2^28015031 is an apocalyptic number.

28015031 is a deficient number, since it is larger than the sum of its proper divisors (5227369).

28015031 is a wasteful number, since it uses less digits than its factorization.

28015031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 28015031 is about 5292.9227275674. The cubic root of 28015031 is about 303.7132243351.

The spelling of 28015031 in words is "twenty-eight million, fifteen thousand, thirty-one".