28520481 has 32 divisors (see below), whose sum is σ = 43084800. Its totient is φ = 16632000.

The previous prime is 28520477. The next prime is 28520491. The reversal of 28520481 is 18402582.

It is not a de Polignac number, because 28520481 - 2² = 28520477 is a prime.

It is a super-3 number, since 3×28520481³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28520491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143220 + ... + 143418.

It is an arithmetic number, because the mean of its divisors is an integer number (1346400).

Almost surely, 2^28520481 is an apocalyptic number.

It is an amenable number.

28520481 is a deficient number, since it is larger than the sum of its proper divisors (14564319).

28520481 is a wasteful number, since it uses less digits than its factorization.

28520481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 28520481 is about 5340.4570029165. The cubic root of 28520481 is about 305.5288897403.

The spelling of 28520481 in words is "twenty-eight million, five hundred twenty thousand, four hundred eighty-one".