28771776 has 168 divisors, whose sum is σ = 95097600. Its totient is φ = 8225280.

The previous prime is 28771759. The next prime is 28771777. The reversal of 28771776 is 67717782.

It is a happy number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771777) 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 23 ways as a sum of consecutive naturals, for example, 120265 + ... + 120503.

Almost surely, 2^28771776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28771776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47548800).

28771776 is an abundant number, since it is smaller than the sum of its proper divisors (66325824).

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

28771776 is a wasteful number, since it uses less digits than its factorization.

28771776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 274 counting only the distinct ones).

The product of its digits is 230496, while the sum is 45.

The square root of 28771776 is about 5363.9328854862. The cubic root of 28771776 is about 306.4236091309.

It can be divided in two parts, 2 and 8771776, that added together give a palindrome (8771778).

The spelling of 28771776 in words is "twenty-eight million, seven hundred seventy-one thousand, seven hundred seventy-six".