28421408 has 24 divisors (see below), whose sum is σ = 56504448. Its totient is φ = 14071104.

The previous prime is 28421383. The next prime is 28421411. The reversal of 28421408 is 80412482.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1016 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (2354352).

Almost surely, 2^28421408 is an apocalyptic number.

It is an amenable number.

28421408 is a deficient number, since it is larger than the sum of its proper divisors (28083040).

28421408 is a wasteful number, since it uses less digits than its factorization.

28421408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8736 (or 8728 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 28421408 is about 5331.1732292245. The cubic root of 28421408 is about 305.1747023847.

It can be divided in two parts, 2 and 8421408, that multiplied together give a square (16842816 = 4104²).

The spelling of 28421408 in words is "twenty-eight million, four hundred twenty-one thousand, four hundred eight".