28771872 has 48 divisors (see below), whose sum is σ = 76259232. Its totient is φ = 9497600.

The previous prime is 28771819. The next prime is 28771889. The reversal of 28771872 is 27817782.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8872 + ... + 11672.

It is an arithmetic number, because the mean of its divisors is an integer number (1588734).

Almost surely, 2^28771872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28771872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38129616).

28771872 is an abundant number, since it is smaller than the sum of its proper divisors (47487360).

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

28771872 is a wasteful number, since it uses less digits than its factorization.

28771872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921 (or 2913 counting only the distinct ones).

The product of its digits is 87808, while the sum is 42.

The square root of 28771872 is about 5363.9418341365. The cubic root of 28771872 is about 306.4239499352.

The spelling of 28771872 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred seventy-two".