243648690 has 16 divisors (see below), whose sum is σ = 584756928. Its totient is φ = 64972976.

The previous prime is 243648653. The next prime is 243648697. The reversal of 243648690 is 96846342.

It is a happy number.

It is a super-2 number, since 2×243648690² = 118729368277432200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243648697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4060782 + ... + 4060841.

It is an arithmetic number, because the mean of its divisors is an integer number (36547308).

Almost surely, 2^243648690 is an apocalyptic number.

243648690 is an abundant number, since it is smaller than the sum of its proper divisors (341108238).

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

243648690 is a wasteful number, since it uses less digits than its factorization.

243648690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121633.

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 243648690 is about 15609.2501421433. The cubic root of 243648690 is about 624.5799332001.

The spelling of 243648690 in words is "two hundred forty-three million, six hundred forty-eight thousand, six hundred ninety".