28956761 has 8 divisors (see below), whose sum is σ = 30448200. Its totient is φ = 27498240.

The previous prime is 28956757. The next prime is 28956827. The reversal of 28956761 is 16765982.

It can be written as a sum of positive squares in 4 ways, for example, as 1600 + 28955161 = 40^2 + 5381^2 .

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 28956761 - 2² = 28956757 is a prime.

It is a super-2 number, since 2×28956761² = 1676988015222242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28956721) 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, 6416 + ... + 9953.

It is an arithmetic number, because the mean of its divisors is an integer number (3806025).

Almost surely, 2^28956761 is an apocalyptic number.

It is an amenable number.

28956761 is a deficient number, since it is larger than the sum of its proper divisors (1491439).

28956761 is a wasteful number, since it uses less digits than its factorization.

28956761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16459.

The product of its digits is 181440, while the sum is 44.

The square root of 28956761 is about 5381.1486691969. The cubic root of 28956761 is about 307.0789124704.

The spelling of 28956761 in words is "twenty-eight million, nine hundred fifty-six thousand, seven hundred sixty-one".