28431089380 has 12 divisors (see below), whose sum is σ = 59705287740. Its totient is φ = 11372435744.

The previous prime is 28431089333. The next prime is 28431089381. The reversal of 28431089380 is 8398013482.

It can be written as a sum of positive squares in 2 ways, for example, as 4334115556 + 24096973824 = 65834^2 + 155232^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28431089380.

It is not an unprimeable number, because it can be changed into a prime (28431089381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710777215 + ... + 710777254.

It is an arithmetic number, because the mean of its divisors is an integer number (4975440645).

Almost surely, 2^28431089380 is an apocalyptic number.

28431089380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28431089380 is an abundant number, since it is smaller than the sum of its proper divisors (31274198360).

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

28431089380 is a wasteful number, since it uses less digits than its factorization.

28431089380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421554478 (or 1421554476 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 28431089380 in words is "twenty-eight billion, four hundred thirty-one million, eighty-nine thousand, three hundred eighty".