28949780000 has 120 divisors (see below), whose sum is σ = 71498847420. Its totient is φ = 11534720000.

The previous prime is 28949779981. The next prime is 28949780009. The reversal of 28949780000 is 8794982.

It can be written as a sum of positive squares in 10 ways, for example, as 10214740624 + 18735039376 = 101068^2 + 136876^2 .

It is not an unprimeable number, because it can be changed into a prime (28949780009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5377310 + ... + 5382690.

Almost surely, 2^28949780000 is an apocalyptic number.

28949780000 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 28949780000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35749423710).

28949780000 is an abundant number, since it is smaller than the sum of its proper divisors (42549067420).

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

28949780000 is an equidigital number, since it uses as much as digits as its factorization.

28949780000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680 (or 5657 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 28949780000 in words is "twenty-eight billion, nine hundred forty-nine million, seven hundred eighty thousand".