28987777 has 16 divisors (see below), whose sum is σ = 36005760. Its totient is φ = 22724352.

The previous prime is 28987769. The next prime is 28987781. The reversal of 28987777 is 77778982.

It is a happy number.

It is not a de Polignac number, because 28987777 - 2³ = 28987769 is a prime.

28987777 is a modest number, since divided by 7777 gives 2898 as remainder.

It is not an unprimeable number, because it can be changed into a prime (28987747) 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 15 ways as a sum of consecutive naturals, for example, 8874 + ... + 11692.

It is an arithmetic number, because the mean of its divisors is an integer number (2250360).

Almost surely, 2^28987777 is an apocalyptic number.

It is an amenable number.

28987777 is a deficient number, since it is larger than the sum of its proper divisors (7017983).

28987777 is a wasteful number, since it uses less digits than its factorization.

28987777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952.

The product of its digits is 2765952, while the sum is 55.

The square root of 28987777 is about 5384.0298104672. The cubic root of 28987777 is about 307.1885122171.

The spelling of 28987777 in words is "twenty-eight million, nine hundred eighty-seven thousand, seven hundred seventy-seven".