243009215064 has 288 divisors, whose sum is σ = 848903412240. Its totient is φ = 62083929600.

The previous prime is 243009215039. The next prime is 243009215069. The reversal of 243009215064 is 460512900342.

It is a happy number.

243009215064 is a `hidden beast` number, since 2 + 430 + 0 + 9 + 215 + 0 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243009215069) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2315962 + ... + 2418614.

Almost surely, 2^243009215064 is an apocalyptic number.

243009215064 is a gapful number since it is divisible by the number (24) 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 243009215064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (424451706120).

243009215064 is an abundant number, since it is smaller than the sum of its proper divisors (605894197176).

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

243009215064 is a wasteful number, since it uses less digits than its factorization.

243009215064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102751 (or 102737 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 243009215064 in words is "two hundred forty-three billion, nine million, two hundred fifteen thousand, sixty-four".