28473831 has 18 divisors (see below), whose sum is σ = 42288792. Its totient is φ = 18461520.

The previous prime is 28473829. The next prime is 28473833. The reversal of 28473831 is 13837482.

It is an interprime number because it is at equal distance from previous prime (28473829) and next prime (28473833).

It is not a de Polignac number, because 28473831 - 2¹ = 28473829 is a prime.

It is a super-2 number, since 2×28473831² = 1621518103633122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28473833) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11166 + ... + 13476.

Almost surely, 2^28473831 is an apocalyptic number.

28473831 is a deficient number, since it is larger than the sum of its proper divisors (13814961).

28473831 is a wasteful number, since it uses less digits than its factorization.

28473831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391 (or 2351 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28473831 is about 5336.0876117245. The cubic root of 28473831 is about 305.3622176940.

The spelling of 28473831 in words is "twenty-eight million, four hundred seventy-three thousand, eight hundred thirty-one".