247444234240 has 112 divisors (see below), whose sum is σ = 678663546912. Its totient is φ = 84837924864.

The previous prime is 247444234217. The next prime is 247444234243. The reversal of 247444234240 is 42432444742.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×247444234240² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 247444234193 and 247444234202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247444234243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144789 + ... + 718228.

Almost surely, 2^247444234240 is an apocalyptic number.

247444234240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247444234240 is an abundant number, since it is smaller than the sum of its proper divisors (431219312672).

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

247444234240 is an frugal number, since it uses more digits than its factorization.

247444234240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863055 (or 863031 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 40.

Adding to 247444234240 its reverse (42432444742), we get a palindrome (289876678982).

The spelling of 247444234240 in words is "two hundred forty-seven billion, four hundred forty-four million, two hundred thirty-four thousand, two hundred forty".