11819457780 has 144 divisors (see below), whose sum is σ = 36081158400. Its totient is φ = 2889509376.

The previous prime is 11819457779. The next prime is 11819457821. The reversal of 11819457780 is 8775491811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1506949 + ... + 1514771.

It is an arithmetic number, because the mean of its divisors is an integer number (250563600).

Almost surely, 2^11819457780 is an apocalyptic number.

11819457780 is a gapful number since it is divisible by the number (10) 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 11819457780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18040579200).

11819457780 is an abundant number, since it is smaller than the sum of its proper divisors (24261700620).

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

11819457780 is a wasteful number, since it uses less digits than its factorization.

11819457780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8010 (or 7995 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 51.

The spelling of 11819457780 in words is "eleven billion, eight hundred nineteen million, four hundred fifty-seven thousand, seven hundred eighty".