28624481 has 8 divisors (see below), whose sum is σ = 30368520. Its totient is φ = 26887168.

The previous prime is 28624451. The next prime is 28624493. The reversal of 28624481 is 18442682.

It can be written as a sum of positive squares in 4 ways, for example, as 7317025 + 21307456 = 2705^2 + 4616^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28624481 is a prime.

It is a super-3 number, since 3×28624481³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28624411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9125 + ... + 11853.

It is an arithmetic number, because the mean of its divisors is an integer number (3796065).

Almost surely, 2^28624481 is an apocalyptic number.

It is an amenable number.

28624481 is a deficient number, since it is larger than the sum of its proper divisors (1744039).

28624481 is a wasteful number, since it uses less digits than its factorization.

28624481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363.

The product of its digits is 24576, while the sum is 35.

The square root of 28624481 is about 5350.1851369836. The cubic root of 28624481 is about 305.8998098526.

The spelling of 28624481 in words is "twenty-eight million, six hundred twenty-four thousand, four hundred eighty-one".