28910408 has 12 divisors (see below), whose sum is σ = 54235545. Its totient is φ = 14447600.

The previous prime is 28910393. The next prime is 28910429. The reversal of 28910408 is 80401982.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 22448644 + 6461764 = 4738^2 + 2542^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3802.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14258 + ... + 16158.

Almost surely, 2^28910408 is an apocalyptic number.

It is an amenable number.

28910408 is a deficient number, since it is larger than the sum of its proper divisors (25325137).

28910408 is an frugal number, since it uses more digits than its factorization.

28910408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3808 (or 1903 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28910408 is about 5376.8399641425. The cubic root of 28910408 is about 306.9149711292.

Multiplying 28910408 by its sum of digits (32), we get a square (925133056 = 30416²).

Multiplying 28910408 by its product of nonzero digits (4608), we get a square (133219160064 = 364992²).

The spelling of 28910408 in words is "twenty-eight million, nine hundred ten thousand, four hundred eight".