28137388080 has 120 divisors (see below), whose sum is σ = 90131146416. Its totient is φ = 7261201920.

The previous prime is 28137388073. The next prime is 28137388093. The reversal of 28137388080 is 8088373182.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169642 + ... + 291638.

Almost surely, 2^28137388080 is an apocalyptic number.

28137388080 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 28137388080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45065573208).

28137388080 is an abundant number, since it is smaller than the sum of its proper divisors (61993758336).

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

28137388080 is a wasteful number, since it uses less digits than its factorization.

28137388080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122075 (or 122038 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 28137388080 in words is "twenty-eight billion, one hundred thirty-seven million, three hundred eighty-eight thousand, eighty".