28981057380 has 96 divisors (see below), whose sum is σ = 88877150208. Its totient is φ = 6997680000.

The previous prime is 28981057363. The next prime is 28981057381. The reversal of 28981057380 is 8375018982.

It is not an unprimeable number, because it can be changed into a prime (28981057381) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 78189 + ... + 253131.

It is an arithmetic number, because the mean of its divisors is an integer number (925803648).

Almost surely, 2^28981057380 is an apocalyptic number.

28981057380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28981057380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44438575104).

28981057380 is an abundant number, since it is smaller than the sum of its proper divisors (59896092828).

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

28981057380 is a wasteful number, since it uses less digits than its factorization.

28981057380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175217 (or 175215 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 28981057380 in words is "twenty-eight billion, nine hundred eighty-one million, fifty-seven thousand, three hundred eighty".