28871420 has 12 divisors (see below), whose sum is σ = 60630024. Its totient is φ = 11548560.

The previous prime is 28871413. The next prime is 28871429. The reversal of 28871420 is 2417882.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721766 + ... + 721805.

It is an arithmetic number, because the mean of its divisors is an integer number (5052502).

Almost surely, 2^28871420 is an apocalyptic number.

28871420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28871420 is an abundant number, since it is smaller than the sum of its proper divisors (31758604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28871420 is a wasteful number, since it uses less digits than its factorization.

28871420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443580 (or 1443578 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 28871420 is about 5373.2131913781. The cubic root of 28871420 is about 306.7769425922.

The spelling of 28871420 in words is "twenty-eight million, eight hundred seventy-one thousand, four hundred twenty".