28067481 has 12 divisors (see below), whose sum is σ = 43660708. Its totient is φ = 17272224.

The previous prime is 28067471. The next prime is 28067483. The reversal of 28067481 is 18476082.

It can be written as a sum of positive squares in 2 ways, for example, as 14561856 + 13505625 = 3816^2 + 3675^2 .

It is not a de Polignac number, because 28067481 - 2¹⁰ = 28066457 is a prime.

It is a super-3 number, since 3×28067481³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28067483) 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, 119830 + ... + 120063.

Almost surely, 2^28067481 is an apocalyptic number.

It is an amenable number.

28067481 is a deficient number, since it is larger than the sum of its proper divisors (15593227).

28067481 is a wasteful number, since it uses less digits than its factorization.

28067481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239912 (or 239909 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28067481 is about 5297.8751400915. The cubic root of 28067481 is about 303.9026444082.

The spelling of 28067481 in words is "twenty-eight million, sixty-seven thousand, four hundred eighty-one".