28277681 has 8 divisors (see below), whose sum is σ = 31517280. Its totient is φ = 25213248.

The previous prime is 28277663. The next prime is 28277687. The reversal of 28277681 is 18677282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28277681 is a prime.

It is a super-2 number, since 2×28277681² = 1599254485475522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28277687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43451 + ... + 44096.

It is an arithmetic number, because the mean of its divisors is an integer number (3939660).

Almost surely, 2^28277681 is an apocalyptic number.

It is an amenable number.

28277681 is a deficient number, since it is larger than the sum of its proper divisors (3239599).

28277681 is a wasteful number, since it uses less digits than its factorization.

28277681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87583.

The product of its digits is 75264, while the sum is 41.

The square root of 28277681 is about 5317.6762782253. The cubic root of 28277681 is about 304.6594101880.

The spelling of 28277681 in words is "twenty-eight million, two hundred seventy-seven thousand, six hundred eighty-one".