28103031 has 20 divisors (see below), whose sum is σ = 45798984. Its totient is φ = 17031600.

The previous prime is 28103003. The next prime is 28103077. The reversal of 28103031 is 13030182.

It is not a de Polignac number, because 28103031 - 2⁶ = 28102967 is a prime.

It is a super-2 number, since 2×28103031² = 1579560702773922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28102995 and 28103013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28103531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14880 + ... + 16661.

Almost surely, 2^28103031 is an apocalyptic number.

28103031 is a deficient number, since it is larger than the sum of its proper divisors (17695953).

28103031 is a wasteful number, since it uses less digits than its factorization.

28103031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31564 (or 31555 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 28103031 is about 5301.2291970825. The cubic root of 28103031 is about 304.0308969924.

The spelling of 28103031 in words is "twenty-eight million, one hundred three thousand, thirty-one".