28006776 has 64 divisors (see below), whose sum is σ = 88915200. Its totient is φ = 8001504.

The previous prime is 28006763. The next prime is 28006777. The reversal of 28006776 is 67760082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28006776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28006777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7750 + ... + 10773.

It is an arithmetic number, because the mean of its divisors is an integer number (1389300).

Almost surely, 2^28006776 is an apocalyptic number.

It is an amenable number.

28006776 is an abundant number, since it is smaller than the sum of its proper divisors (60908424).

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

28006776 is a wasteful number, since it uses less digits than its factorization.

28006776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18545 (or 18535 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 28006776 is about 5292.1428552147. The cubic root of 28006776 is about 303.6833903629.

It can be divided in two parts, 28006 and 776, that added together give a palindrome (28782).

The spelling of 28006776 in words is "twenty-eight million, six thousand, seven hundred seventy-six".