28043631 has 96 divisors (see below), whose sum is σ = 55157760. Its totient is φ = 13910400.

The previous prime is 28043627. The next prime is 28043641. The reversal of 28043631 is 13634082.

It is a happy number.

28043631 is a `hidden beast` number, since 28 + 0 + 4 + 3 + 631 = 666.

It is not a de Polignac number, because 28043631 - 2² = 28043627 is a prime.

It is a super-2 number, since 2×28043631² = 1572890479328322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28043595 and 28043604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28043621) 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 95 ways as a sum of consecutive naturals, for example, 596650 + ... + 596696.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^28043631 is an apocalyptic number.

28043631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28043631 is a deficient number, since it is larger than the sum of its proper divisors (27114129).

28043631 is a wasteful number, since it uses less digits than its factorization.

28043631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28043631 is about 5295.6237592941. The cubic root of 28043631 is about 303.8165408253.

The spelling of 28043631 in words is "twenty-eight million, forty-three thousand, six hundred thirty-one".