28956481 has 4 divisors (see below), whose sum is σ = 28973700. Its totient is φ = 28939264.

The previous prime is 28956463. The next prime is 28956509. The reversal of 28956481 is 18465982.

It is a happy number.

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 7612081 + 21344400 = 2759^2 + 4620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28956481 is a prime.

It is a super-2 number, since 2×28956481² = 1676955583806722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28956451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5776 + ... + 9553.

It is an arithmetic number, because the mean of its divisors is an integer number (7243425).

Almost surely, 2^28956481 is an apocalyptic number.

It is an amenable number.

28956481 is a deficient number, since it is larger than the sum of its proper divisors (17219).

28956481 is a wasteful number, since it uses less digits than its factorization.

28956481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17218.

The product of its digits is 138240, while the sum is 43.

The square root of 28956481 is about 5381.1226523840. The cubic root of 28956481 is about 307.0779226915.

The spelling of 28956481 in words is "twenty-eight million, nine hundred fifty-six thousand, four hundred eighty-one".