28921047064 has 48 divisors (see below), whose sum is σ = 67107607920. Its totient is φ = 11441289600.

The previous prime is 28921047059. The next prime is 28921047083. The reversal of 28921047064 is 46074012982.

It is a self number, because there is not a number n which added to its sum of digits gives 28921047064.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1518487 + ... + 1537414.

It is an arithmetic number, because the mean of its divisors is an integer number (1398075165).

Almost surely, 2^28921047064 is an apocalyptic number.

It is an amenable number.

28921047064 is an abundant number, since it is smaller than the sum of its proper divisors (38186560856).

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

28921047064 is a wasteful number, since it uses less digits than its factorization.

28921047064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055940 (or 3055923 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 28921047064 in words is "twenty-eight billion, nine hundred twenty-one million, forty-seven thousand, sixty-four".