28786761 has 12 divisors (see below), whose sum is σ = 41881840. Its totient is φ = 19052280.

The previous prime is 28786759. The next prime is 28786781. The reversal of 28786761 is 16768782.

It is not a de Polignac number, because 28786761 - 2¹ = 28786759 is a prime.

It is a super-2 number, since 2×28786761² = 1657355217742242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28786711) 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 11 ways as a sum of consecutive naturals, for example, 10255 + ... + 12756.

Almost surely, 2^28786761 is an apocalyptic number.

It is an amenable number.

28786761 is a deficient number, since it is larger than the sum of its proper divisors (13095079).

28786761 is a wasteful number, since it uses less digits than its factorization.

28786761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23156 (or 23153 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28786761 is about 5365.3295332160. The cubic root of 28786761 is about 306.4767973764.

The spelling of 28786761 in words is "twenty-eight million, seven hundred eighty-six thousand, seven hundred sixty-one".