28703831 has 4 divisors (see below), whose sum is σ = 30911832. Its totient is φ = 26495832.

The previous prime is 28703827. The next prime is 28703849. The reversal of 28703831 is 13830782.

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

It is a cyclic number.

It is not a de Polignac number, because 28703831 - 2² = 28703827 is a prime.

It is a super-2 number, since 2×28703831² = 1647819828153122, 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 (28703821) 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 3 ways as a sum of consecutive naturals, for example, 1103981 + ... + 1104006.

It is an arithmetic number, because the mean of its divisors is an integer number (7727958).

Almost surely, 2^28703831 is an apocalyptic number.

28703831 is a deficient number, since it is larger than the sum of its proper divisors (2208001).

28703831 is a wasteful number, since it uses less digits than its factorization.

28703831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208000.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28703831 is about 5357.5956361039. The cubic root of 28703831 is about 306.1822109573.

The spelling of 28703831 in words is "twenty-eight million, seven hundred three thousand, eight hundred thirty-one".