28720344748 has 24 divisors (see below), whose sum is σ = 56018012400. Its totient is φ = 12804115968.

The previous prime is 28720344739. The next prime is 28720344781. The reversal of 28720344748 is 84744302782.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11113393 + ... + 11115976.

It is an arithmetic number, because the mean of its divisors is an integer number (2334083850).

Almost surely, 2^28720344748 is an apocalyptic number.

It is an amenable number.

28720344748 is a deficient number, since it is larger than the sum of its proper divisors (27297667652).

28720344748 is a wasteful number, since it uses less digits than its factorization.

28720344748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22229409 (or 22229407 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 49.

It can be divided in two parts, 2872034 and 4748, that added together give a palindrome (2876782).

The spelling of 28720344748 in words is "twenty-eight billion, seven hundred twenty million, three hundred forty-four thousand, seven hundred forty-eight".