28547631 has 12 divisors (see below), whose sum is σ = 47126352. Its totient is φ = 16312896.

The previous prime is 28547627. The next prime is 28547639. The reversal of 28547631 is 13674582.

It is not a de Polignac number, because 28547631 - 2² = 28547627 is a prime.

It is a super-2 number, since 2×28547631² = 1629934471424322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28547639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226506 + ... + 226631.

It is an arithmetic number, because the mean of its divisors is an integer number (3927196).

Almost surely, 2^28547631 is an apocalyptic number.

28547631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28547631 is a deficient number, since it is larger than the sum of its proper divisors (18578721).

28547631 is a wasteful number, since it uses less digits than its factorization.

28547631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453150 (or 453147 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28547631 is about 5342.9983155528. The cubic root of 28547631 is about 305.6258081452.

The spelling of 28547631 in words is "twenty-eight million, five hundred forty-seven thousand, six hundred thirty-one".