242991720 has 48 divisors (see below), whose sum is σ = 789724260. Its totient is φ = 64797696.

The previous prime is 242991719. The next prime is 242991787. The reversal of 242991720 is 27199242.

It can be written as a sum of positive squares in 2 ways, for example, as 239816196 + 3175524 = 15486^2 + 1782^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337129 + ... + 337848.

Almost surely, 2^242991720 is an apocalyptic number.

242991720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242991720 is an abundant number, since it is smaller than the sum of its proper divisors (546732540).

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

242991720 is a wasteful number, since it uses less digits than its factorization.

242991720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674994 (or 674987 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 242991720 is about 15588.1916847337. The cubic root of 242991720 is about 624.0180591420.

It can be divided in two parts, 2429 and 91720, that added together give a palindrome (94149).

The spelling of 242991720 in words is "two hundred forty-two million, nine hundred ninety-one thousand, seven hundred twenty".