28999309140 has 36 divisors (see below), whose sum is σ = 87964571604. Its totient is φ = 7733149056.

The previous prime is 28999309139. The next prime is 28999309153. The reversal of 28999309140 is 4190399982.

It can be written as a sum of positive squares in 2 ways, for example, as 15746234256 + 13253074884 = 125484^2 + 115122^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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, 80553457 + ... + 80553816.

Almost surely, 2^28999309140 is an apocalyptic number.

28999309140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28999309140 is an abundant number, since it is smaller than the sum of its proper divisors (58965262464).

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

28999309140 is a wasteful number, since it uses less digits than its factorization.

28999309140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161107288 (or 161107283 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 28999309140 in words is "twenty-eight billion, nine hundred ninety-nine million, three hundred nine thousand, one hundred forty".