28781430284 has 24 divisors (see below), whose sum is σ = 51867161808. Its totient is φ = 13966505280.

The previous prime is 28781430281. The next prime is 28781430289. The reversal of 28781430284 is 48203418782.

It is a happy number.

It is a super-3 number, since 3×28781430284³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (47) 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 (28781430281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505907 + ... + 559914.

It is an arithmetic number, because the mean of its divisors is an integer number (2161131742).

Almost surely, 2^28781430284 is an apocalyptic number.

It is an amenable number.

28781430284 is a deficient number, since it is larger than the sum of its proper divisors (23085731524).

28781430284 is a wasteful number, since it uses less digits than its factorization.

28781430284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066025 (or 1066023 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 47.

The spelling of 28781430284 in words is "twenty-eight billion, seven hundred eighty-one million, four hundred thirty thousand, two hundred eighty-four".