28771456 has 64 divisors (see below), whose sum is σ = 66242880. Its totient is φ = 12192768.

The previous prime is 28771447. The next prime is 28771481. The reversal of 28771456 is 65417782.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 145950 + ... + 146146.

It is an arithmetic number, because the mean of its divisors is an integer number (1035045).

Almost surely, 2^28771456 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 28771456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33121440).

28771456 is an abundant number, since it is smaller than the sum of its proper divisors (37471424).

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

28771456 is a wasteful number, since it uses less digits than its factorization.

28771456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 369 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 28771456 is about 5363.9030565438. The cubic root of 28771456 is about 306.4224731112.

The spelling of 28771456 in words is "twenty-eight million, seven hundred seventy-one thousand, four hundred fifty-six".