243947028864 has 128 divisors (see below), whose sum is σ = 807876622080. Its totient is φ = 63362856960.

The previous prime is 243947028863. The next prime is 243947028887. The reversal of 243947028864 is 468820749342.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243947028863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4095619 + ... + 4154754.

It is an arithmetic number, because the mean of its divisors is an integer number (6311536110).

Almost surely, 2^243947028864 is an apocalyptic number.

243947028864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

243947028864 is an abundant number, since it is smaller than the sum of its proper divisors (563929593216).

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

243947028864 is a wasteful number, since it uses less digits than its factorization.

243947028864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8250408 (or 8250396 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 57.

The spelling of 243947028864 in words is "two hundred forty-three billion, nine hundred forty-seven million, twenty-eight thousand, eight hundred sixty-four".