28911552 has 56 divisors (see below), whose sum is σ = 79833216. Its totient is φ = 9216768.

The previous prime is 28911539. The next prime is 28911557. The reversal of 28911552 is 25511982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28911557) 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, 1143 + ... + 7689.

Almost surely, 2^28911552 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 28911552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39916608).

28911552 is an abundant number, since it is smaller than the sum of its proper divisors (50921664).

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

28911552 is a wasteful number, since it uses less digits than its factorization.

28911552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6585 (or 6575 counting only the distinct ones).

The product of its digits is 7200, while the sum is 33.

The square root of 28911552 is about 5376.9463452781. The cubic root of 28911552 is about 306.9190193379.

The spelling of 28911552 in words is "twenty-eight million, nine hundred eleven thousand, five hundred fifty-two".