28786031 has 4 divisors (see below), whose sum is σ = 28797000. Its totient is φ = 28775064.

The previous prime is 28786003. The next prime is 28786039. The reversal of 28786031 is 13068782.

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 28786031 - 2¹⁰ = 28785007 is a prime.

It is a super-2 number, since 2×28786031² = 1657271161465922, 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 = 28785982 and 28786000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28786039) 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, 1040 + ... + 7658.

It is an arithmetic number, because the mean of its divisors is an integer number (7199250).

Almost surely, 2^28786031 is an apocalyptic number.

28786031 is a deficient number, since it is larger than the sum of its proper divisors (10969).

28786031 is an equidigital number, since it uses as much as digits as its factorization.

28786031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10968.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28786031 is about 5365.2615034125. The cubic root of 28786031 is about 306.4742067184.

The spelling of 28786031 in words is "twenty-eight million, seven hundred eighty-six thousand, thirty-one".