4989981780 has 768 divisors, whose sum is σ = 20398694400. Its totient is φ = 985374720.

The previous prime is 4989981757. The next prime is 4989981781. The reversal of 4989981780 is 871899894.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4989981781) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 74477307 + ... + 74477373.

It is an arithmetic number, because the mean of its divisors is an integer number (26560800).

Almost surely, 2^4989981780 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 4989981780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10199347200).

4989981780 is an abundant number, since it is smaller than the sum of its proper divisors (15408712620).

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

4989981780 is a wasteful number, since it uses less digits than its factorization.

4989981780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The square root of 4989981780 is about 70639.8030857958. The cubic root of 4989981780 is about 1708.8331220500.

The spelling of 4989981780 in words is "four billion, nine hundred eighty-nine million, nine hundred eighty-one thousand, seven hundred eighty".