28776642280 has 64 divisors (see below), whose sum is σ = 71118518400. Its totient is φ = 10430703360.

The previous prime is 28776642269. The next prime is 28776642289. The reversal of 28776642280 is 8224667782.

It is a happy number.

It is a super-3 number, since 3×28776642280³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28776642289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805651 + ... + 840610.

It is an arithmetic number, because the mean of its divisors is an integer number (1111226850).

Almost surely, 2^28776642280 is an apocalyptic number.

28776642280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28776642280 is an abundant number, since it is smaller than the sum of its proper divisors (42341876120).

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

28776642280 is a wasteful number, since it uses less digits than its factorization.

28776642280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646314 (or 1646310 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 52.

The spelling of 28776642280 in words is "twenty-eight billion, seven hundred seventy-six million, six hundred forty-two thousand, two hundred eighty".