243073728 has 84 divisors (see below), whose sum is σ = 719254848. Its totient is φ = 78405120.

The previous prime is 243073723. The next prime is 243073739. The reversal of 243073728 is 827370342.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 243073692 and 243073701.

It is not an unprimeable number, because it can be changed into a prime (243073723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11050 + ... + 24662.

Almost surely, 2^243073728 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 243073728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359627424).

243073728 is an abundant number, since it is smaller than the sum of its proper divisors (476181120).

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

243073728 is a wasteful number, since it uses less digits than its factorization.

243073728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13662 (or 13649 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 243073728 is about 15590.8219154732. The cubic root of 243073728 is about 624.0882518178.

The spelling of 243073728 in words is "two hundred forty-three million, seventy-three thousand, seven hundred twenty-eight".