28771021092 has 48 divisors (see below), whose sum is σ = 77089824000. Its totient is φ = 8259622560.

The previous prime is 28771021087. The next prime is 28771021093. The reversal of 28771021092 is 29012017782.

It is a self number, because there is not a number n which added to its sum of digits gives 28771021092.

It is not an unprimeable number, because it can be changed into a prime (28771021093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5733342 + ... + 5738357.

It is an arithmetic number, because the mean of its divisors is an integer number (1606038000).

Almost surely, 2^28771021092 is an apocalyptic number.

28771021092 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28771021092 is an abundant number, since it is smaller than the sum of its proper divisors (48318802908).

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

28771021092 is a wasteful number, since it uses less digits than its factorization.

28771021092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11471736 (or 11471734 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The spelling of 28771021092 in words is "twenty-eight billion, seven hundred seventy-one million, twenty-one thousand, ninety-two".