28481405 has 16 divisors (see below), whose sum is σ = 35956224. Its totient is φ = 21627840.

The previous prime is 28481381. The next prime is 28481407. The reversal of 28481405 is 50418482.

It is a happy number.

It is not a de Polignac number, because 28481405 - 2⁸ = 28481149 is a prime.

It is a super-2 number, since 2×28481405² = 1622380861548050, 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 (28481407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6482 + ... + 9948.

It is an arithmetic number, because the mean of its divisors is an integer number (2247264).

Almost surely, 2^28481405 is an apocalyptic number.

It is an amenable number.

28481405 is a deficient number, since it is larger than the sum of its proper divisors (7474819).

28481405 is a wasteful number, since it uses less digits than its factorization.

28481405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 28481405 is about 5336.7972605300. The cubic root of 28481405 is about 305.3892906041.

Adding to 28481405 its reverse (50418482), we get a palindrome (78899887).

The spelling of 28481405 in words is "twenty-eight million, four hundred eighty-one thousand, four hundred five".