28920720902 has 16 divisors (see below), whose sum is σ = 45178182000. Its totient is φ = 13868020320.

The previous prime is 28920720883. The next prime is 28920720923. The reversal of 28920720902 is 20902702982.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28920720902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1664624 + ... + 1681907.

It is an arithmetic number, because the mean of its divisors is an integer number (2823636375).

Almost surely, 2^28920720902 is an apocalyptic number.

28920720902 is a deficient number, since it is larger than the sum of its proper divisors (16257461098).

28920720902 is a wasteful number, since it uses less digits than its factorization.

28920720902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346711.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 28920720902 in words is "twenty-eight billion, nine hundred twenty million, seven hundred twenty thousand, nine hundred two".