28734505 has 16 divisors (see below), whose sum is σ = 37771920. Its totient is φ = 20887552.

The previous prime is 28734499. The next prime is 28734509. The reversal of 28734505 is 50543782.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1245456 + 27489049 = 1116^2 + 5243^2 .

It is a cyclic number.

It is not a de Polignac number, because 28734505 - 2²¹ = 26637353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28734509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3364 + ... + 8293.

It is an arithmetic number, because the mean of its divisors is an integer number (2360745).

Almost surely, 2^28734505 is an apocalyptic number.

It is an amenable number.

28734505 is a deficient number, since it is larger than the sum of its proper divisors (9037415).

28734505 is a wasteful number, since it uses less digits than its factorization.

28734505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11708.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 28734505 is about 5360.4575364422. The cubic root of 28734505 is about 306.2912380953.

The spelling of 28734505 in words is "twenty-eight million, seven hundred thirty-four thousand, five hundred five".