243667920 has 80 divisors (see below), whose sum is σ = 773825472. Its totient is φ = 63390720.

The previous prime is 243667901. The next prime is 243667937. The reversal of 243667920 is 29766342.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2542 + ... + 22221.

Almost surely, 2^243667920 is an apocalyptic number.

243667920 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 243667920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386912736).

243667920 is an abundant number, since it is smaller than the sum of its proper divisors (530157552).

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

243667920 is a wasteful number, since it uses less digits than its factorization.

243667920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24820 (or 24814 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 243667920 is about 15609.8661108928. The cubic root of 243667920 is about 624.5963644481.

The spelling of 243667920 in words is "two hundred forty-three million, six hundred sixty-seven thousand, nine hundred twenty".