28214631 has 12 divisors (see below), whose sum is σ = 41116608. Its totient is φ = 18642624.

The previous prime is 28214591. The next prime is 28214633. The reversal of 28214631 is 13641282.

28214631 is a `hidden beast` number, since 2 + 8 + 21 + 4 + 631 = 666.

It is not a de Polignac number, because 28214631 - 2⁷ = 28214503 is a prime.

It is a super-2 number, since 2×28214631² = 1592130804932322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28214595 and 28214604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28214633) 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, 12855 + ... + 14888.

It is an arithmetic number, because the mean of its divisors is an integer number (3426384).

Almost surely, 2^28214631 is an apocalyptic number.

28214631 is a deficient number, since it is larger than the sum of its proper divisors (12901977).

28214631 is a wasteful number, since it uses less digits than its factorization.

28214631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27862 (or 27859 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 28214631 is about 5311.7446286507. The cubic root of 28214631 is about 304.4328113383.

The spelling of 28214631 in words is "twenty-eight million, two hundred fourteen thousand, six hundred thirty-one".