243778120 has 32 divisors (see below), whose sum is σ = 554671800. Its totient is φ = 96414208.

The previous prime is 243778099. The next prime is 243778259. The reversal of 243778120 is 21877342.

It can be written as a sum of positive squares in 4 ways, for example, as 182844484 + 60933636 = 13522^2 + 7806^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30679 + ... + 37798.

Almost surely, 2^243778120 is an apocalyptic number.

243778120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243778120 is an abundant number, since it is smaller than the sum of its proper divisors (310893680).

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

243778120 is a wasteful number, since it uses less digits than its factorization.

243778120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68577 (or 68573 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 243778120 is about 15613.3955307614. The cubic root of 243778120 is about 624.6905091700.

The spelling of 243778120 in words is "two hundred forty-three million, seven hundred seventy-eight thousand, one hundred twenty".