243978915180 has 720 divisors, whose sum is σ = 944638136064. Its totient is φ = 45708848640.

The previous prime is 243978915163. The next prime is 243978915199. The reversal of 243978915180 is 81519879342.

It is a super-2 number, since 2×243978915180² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243978915180.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 5673928239 + ... + 5673928281.

Almost surely, 2^243978915180 is an apocalyptic number.

243978915180 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 243978915180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (472319068032).

243978915180 is an abundant number, since it is smaller than the sum of its proper divisors (700659220884).

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

243978915180 is a wasteful number, since it uses less digits than its factorization.

243978915180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 243978915180 in words is "two hundred forty-three billion, nine hundred seventy-eight million, nine hundred fifteen thousand, one hundred eighty".