243686478464 has 512 divisors, whose sum is σ = 621831168000. Its totient is φ = 93542400000.

The previous prime is 243686478439. The next prime is 243686478479. The reversal of 243686478464 is 464874686342.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a junction number, because it is equal to n+sod(n) for n = 243686478397 and 243686478406.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 970862339 + ... + 970862589.

It is an arithmetic number, because the mean of its divisors is an integer number (1214514000).

Almost surely, 2^243686478464 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 243686478464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310915584000).

243686478464 is an abundant number, since it is smaller than the sum of its proper divisors (378144689536).

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

243686478464 is a wasteful number, since it uses less digits than its factorization.

243686478464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 396 counting only the distinct ones).

The product of its digits is 148635648, while the sum is 62.

The spelling of 243686478464 in words is "two hundred forty-three billion, six hundred eighty-six million, four hundred seventy-eight thousand, four hundred sixty-four".