28971552 has 48 divisors (see below), whose sum is σ = 77680512. Its totient is φ = 9450240.

The previous prime is 28971541. The next prime is 28971601. The reversal of 28971552 is 25517982.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28971552.

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, 1302 + ... + 7722.

It is an arithmetic number, because the mean of its divisors is an integer number (1618344).

Almost surely, 2^28971552 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 28971552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38840256).

28971552 is an abundant number, since it is smaller than the sum of its proper divisors (48708960).

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

28971552 is a wasteful number, since it uses less digits than its factorization.

28971552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6481 (or 6473 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 28971552 is about 5382.5228285628. The cubic root of 28971552 is about 307.1311884722.

The spelling of 28971552 in words is "twenty-eight million, nine hundred seventy-one thousand, five hundred fifty-two".