28171408 has 40 divisors (see below), whose sum is σ = 56246400. Its totient is φ = 13663104.

The previous prime is 28171399. The next prime is 28171411. The reversal of 28171408 is 80417182.

It is a self number, because there is not a number n which added to its sum of digits gives 28171408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117753 + ... + 117991.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160).

Almost surely, 2^28171408 is an apocalyptic number.

It is an amenable number.

28171408 is a deficient number, since it is larger than the sum of its proper divisors (28074992).

28171408 is a wasteful number, since it uses less digits than its factorization.

28171408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 28171408 is about 5307.6744436712. The cubic root of 28171408 is about 304.2772747250.

It can be divided in two parts, 2817 and 1408, that multiplied together give a triangular number (3966336 = T₂₈₁₆).

The spelling of 28171408 in words is "twenty-eight million, one hundred seventy-one thousand, four hundred eight".