28849877780 has 48 divisors (see below), whose sum is σ = 63885581760. Its totient is φ = 10913356800.

The previous prime is 28849877779. The next prime is 28849877831. The reversal of 28849877780 is 8777894882.

It is a self number, because there is not a number n which added to its sum of digits gives 28849877780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150500 + ... + 283460.

It is an arithmetic number, because the mean of its divisors is an integer number (1330949620).

Almost surely, 2^28849877780 is an apocalyptic number.

28849877780 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 28849877780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31942790880).

28849877780 is an abundant number, since it is smaller than the sum of its proper divisors (35035703980).

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

28849877780 is a wasteful number, since it uses less digits than its factorization.

28849877780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133560 (or 133558 counting only the distinct ones).

The product of its (nonzero) digits is 101154816, while the sum is 68.

The spelling of 28849877780 in words is "twenty-eight billion, eight hundred forty-nine million, eight hundred seventy-seven thousand, seven hundred eighty".