28224939 has 12 divisors (see below), whose sum is σ = 38255336. Its totient is φ = 18507168.

The previous prime is 28224919. The next prime is 28224941. The reversal of 28224939 is 93942282.

It is a happy number.

It is not a de Polignac number, because 28224939 - 2¹¹ = 28222891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28224897 and 28224906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28224919) 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, 78442 + ... + 78800.

Almost surely, 2^28224939 is an apocalyptic number.

28224939 is a deficient number, since it is larger than the sum of its proper divisors (10030397).

28224939 is an frugal number, since it uses more digits than its factorization.

28224939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 435 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 28224939 is about 5312.7148427146. The cubic root of 28224939 is about 304.4698808920.

The spelling of 28224939 in words is "twenty-eight million, two hundred twenty-four thousand, nine hundred thirty-nine".