28448431 has 6 divisors (see below), whose sum is σ = 31269896. Its totient is φ = 25862100.

The previous prime is 28448423. The next prime is 28448437. The reversal of 28448431 is 13484482.

It is a happy number.

It is not a de Polignac number, because 28448431 - 2³ = 28448423 is a prime.

It is a super-2 number, since 2×28448431² = 1618626452723522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28448437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117435 + ... + 117676.

Almost surely, 2^28448431 is an apocalyptic number.

28448431 is a deficient number, since it is larger than the sum of its proper divisors (2821465).

28448431 is a wasteful number, since it uses less digits than its factorization.

28448431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235133 (or 235122 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

The square root of 28448431 is about 5333.7070598225. The cubic root of 28448431 is about 305.2713915155.

The spelling of 28448431 in words is "twenty-eight million, four hundred forty-eight thousand, four hundred thirty-one".