28152961 has 4 divisors (see below), whose sum is σ = 28538692. Its totient is φ = 27767232.

The previous prime is 28152959. The next prime is 28152973. The reversal of 28152961 is 16925182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24561936 + 3591025 = 4956^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 28152961 - 2¹ = 28152959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28150961) 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, 192756 + ... + 192901.

It is an arithmetic number, because the mean of its divisors is an integer number (7134673).

Almost surely, 2^28152961 is an apocalyptic number.

It is an amenable number.

28152961 is a deficient number, since it is larger than the sum of its proper divisors (385731).

28152961 is an equidigital number, since it uses as much as digits as its factorization.

28152961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385730.

The product of its digits is 8640, while the sum is 34.

The square root of 28152961 is about 5305.9363923817. The cubic root of 28152961 is about 304.2108453333.

It can be divided in two parts, 2815 and 2961, that added together give a square (5776 = 76²).

The spelling of 28152961 in words is "twenty-eight million, one hundred fifty-two thousand, nine hundred sixty-one".