28769776 has 20 divisors (see below), whose sum is σ = 63704752. Its totient is φ = 12329856.

The previous prime is 28769771. The next prime is 28769777. The reversal of 28769776 is 67796782.

It is a happy number.

It is a super-2 number, since 2×28769776² = 1655400022180352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28769771) 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 3 ways as a sum of consecutive naturals, for example, 128325 + ... + 128548.

Almost surely, 2^28769776 is an apocalyptic number.

It is an amenable number.

28769776 is an abundant number, since it is smaller than the sum of its proper divisors (34934976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28769776 is a wasteful number, since it uses less digits than its factorization.

28769776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256888 (or 256882 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 52.

The square root of 28769776 is about 5363.7464518748. The cubic root of 28769776 is about 306.4165088692.

The spelling of 28769776 in words is "twenty-eight million, seven hundred sixty-nine thousand, seven hundred seventy-six".