28091487380 has 24 divisors (see below), whose sum is σ = 64355044320. Its totient is φ = 10215086240.

The previous prime is 28091487379. The next prime is 28091487383. The reversal of 28091487380 is 8378419082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28091487383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63844070 + ... + 63844509.

It is an arithmetic number, because the mean of its divisors is an integer number (2681460180).

Almost surely, 2^28091487380 is an apocalyptic number.

28091487380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28091487380 is an abundant number, since it is smaller than the sum of its proper divisors (36263556940).

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

28091487380 is a wasteful number, since it uses less digits than its factorization.

28091487380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127688599 (or 127688597 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 28091487380 in words is "twenty-eight billion, ninety-one million, four hundred eighty-seven thousand, three hundred eighty".