28704961 has 8 divisors (see below), whose sum is σ = 29499624. Its totient is φ = 27914880.

The previous prime is 28704947. The next prime is 28704979. The reversal of 28704961 is 16940782.

It can be written as a sum of positive squares in 4 ways, for example, as 1089936 + 27615025 = 1044^2 + 5255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28704961 - 2¹⁹ = 28180673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28704961.

It is not an unprimeable number, because it can be changed into a prime (28704911) 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, 14355 + ... + 16231.

It is an arithmetic number, because the mean of its divisors is an integer number (3687453).

Almost surely, 2^28704961 is an apocalyptic number.

It is an amenable number.

28704961 is a deficient number, since it is larger than the sum of its proper divisors (794663).

28704961 is a wasteful number, since it uses less digits than its factorization.

28704961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28704961 is about 5357.7010928196. The cubic root of 28704961 is about 306.1862287875.

The spelling of 28704961 in words is "twenty-eight million, seven hundred four thousand, nine hundred sixty-one".