28049871 has 8 divisors (see below), whose sum is σ = 39368320. Its totient is φ = 17715672.

The previous prime is 28049867. The next prime is 28049891. The reversal of 28049871 is 17894082.

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

It is not a de Polignac number, because 28049871 - 2² = 28049867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28049891) 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, 245995 + ... + 246108.

It is an arithmetic number, because the mean of its divisors is an integer number (4921040).

Almost surely, 2^28049871 is an apocalyptic number.

28049871 is a deficient number, since it is larger than the sum of its proper divisors (11318449).

28049871 is a wasteful number, since it uses less digits than its factorization.

28049871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492125.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 28049871 is about 5296.2128922467. The cubic root of 28049871 is about 303.8390732692.

It can be divided in two parts, 28049 and 871, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28049871 in words is "twenty-eight million, forty-nine thousand, eight hundred seventy-one".