28731552 has 24 divisors (see below), whose sum is σ = 75420576. Its totient is φ = 9577152.

The previous prime is 28731551. The next prime is 28731569. The reversal of 28731552 is 25513782.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (28731551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149548 + ... + 149739.

It is an arithmetic number, because the mean of its divisors is an integer number (3142524).

Almost surely, 2^28731552 is an apocalyptic number.

It is an amenable number.

28731552 is an abundant number, since it is smaller than the sum of its proper divisors (46689024).

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

28731552 is a wasteful number, since it uses less digits than its factorization.

28731552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299300 (or 299292 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 28731552 is about 5360.1820864594. The cubic root of 28731552 is about 306.2807453792.

The spelling of 28731552 in words is "twenty-eight million, seven hundred thirty-one thousand, five hundred fifty-two".