243726620026540 has 96 divisors (see below), whose sum is σ = 585107140552704. Its totient is φ = 83540094785280.

The previous prime is 243726620026493. The next prime is 243726620026543. The reversal of 243726620026540 is 45620026627342.

It is a happy number.

It is a super-2 number, since 2×243726620026540² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243726620026543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9835208950 + ... + 9835233730.

It is an arithmetic number, because the mean of its divisors is an integer number (6094866047424).

Almost surely, 2^{243726620026540} is an apocalyptic number.

243726620026540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243726620026540 is an abundant number, since it is smaller than the sum of its proper divisors (341380520526164).

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

243726620026540 is a wasteful number, since it uses less digits than its factorization.

243726620026540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41567 (or 41565 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 49.

The spelling of 243726620026540 in words is "two hundred forty-three trillion, seven hundred twenty-six billion, six hundred twenty million, twenty-six thousand, five hundred forty".