28744620321840 has 160 divisors (see below), whose sum is σ = 91596199182336. Its totient is φ = 7451581363200.

The previous prime is 28744620321721. The next prime is 28744620321847. The reversal of 28744620321840 is 4812302644782.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28744620321847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8814709 + ... + 11627051.

Almost surely, 2^{28744620321840} is an apocalyptic number.

28744620321840 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 28744620321840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45798099591168).

28744620321840 is an abundant number, since it is smaller than the sum of its proper divisors (62851578860496).

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

28744620321840 is a wasteful number, since it uses less digits than its factorization.

28744620321840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813547 (or 2813541 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 51.

The spelling of 28744620321840 in words is "twenty-eight trillion, seven hundred forty-four billion, six hundred twenty million, three hundred twenty-one thousand, eight hundred forty".