243421680 has 40 divisors (see below), whose sum is σ = 754607952. Its totient is φ = 64912384.

The previous prime is 243421663. The next prime is 243421699. The reversal of 243421680 is 86124342.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×243421680² = 118508228588044800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 506889 + ... + 507368.

Almost surely, 2^243421680 is an apocalyptic number.

243421680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243421680 is an abundant number, since it is smaller than the sum of its proper divisors (511186272).

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

243421680 is a wasteful number, since it uses less digits than its factorization.

243421680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014273 (or 1014267 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 243421680 is about 15601.9767978292. The cubic root of 243421680 is about 624.3858970684.

The spelling of 243421680 in words is "two hundred forty-three million, four hundred twenty-one thousand, six hundred eighty".