28418481 has 36 divisors (see below), whose sum is σ = 51434292. Its totient is φ = 14986944.

The previous prime is 28418473. The next prime is 28418491. The reversal of 28418481 is 18481482.

It is a happy number.

28418481 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 14130081 + 14288400 = 3759^2 + 3780^2 .

It is not a de Polignac number, because 28418481 - 2³ = 28418473 is a prime.

It is a super-2 number, since 2×28418481² = 1615220124694722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28418461) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3255 + ... + 8211.

Almost surely, 2^28418481 is an apocalyptic number.

28418481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28418481 is a deficient number, since it is larger than the sum of its proper divisors (23015811).

28418481 is a wasteful number, since it uses less digits than its factorization.

28418481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4990 (or 4980 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 28418481 is about 5330.8987047214. The cubic root of 28418481 is about 305.1642258100.

The spelling of 28418481 in words is "twenty-eight million, four hundred eighteen thousand, four hundred eighty-one".