28779021921732 has 96 divisors (see below), whose sum is σ = 71748384325632. Its totient is φ = 8957237874816.

The previous prime is 28779021921703. The next prime is 28779021921739. The reversal of 28779021921732 is 23712912097782.

It is not an unprimeable number, because it can be changed into a prime (28779021921739) 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, 2071998 + ... + 7864554.

It is an arithmetic number, because the mean of its divisors is an integer number (747379003392).

Almost surely, 2^{28779021921732} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28779021921732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35874192162816).

28779021921732 is an abundant number, since it is smaller than the sum of its proper divisors (42969362403900).

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

28779021921732 is a wasteful number, since it uses less digits than its factorization.

28779021921732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793017 (or 5793015 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 60.

The spelling of 28779021921732 in words is "twenty-eight trillion, seven hundred seventy-nine billion, twenty-one million, nine hundred twenty-one thousand, seven hundred thirty-two".