72540412663220 has 24 divisors (see below), whose sum is σ = 152335280961864. Its totient is φ = 29016086137856.

The previous prime is 72540412663181. The next prime is 72540412663247. The reversal of 72540412663220 is 2236621404527.

It can be written as a sum of positive squares in 4 ways, for example, as 2719715512336 + 69820697150884 = 1649156^2 + 8355878^2 .

It is a super-2 number, since 2×72540412663220² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2907404 + ... + 12390876.

It is an arithmetic number, because the mean of its divisors is an integer number (6347303373411).

Almost surely, 2^{72540412663220} is an apocalyptic number.

It is an amenable number.

72540412663220 is an abundant number, since it is smaller than the sum of its proper divisors (79794868298644).

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

72540412663220 is a wasteful number, since it uses less digits than its factorization.

72540412663220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9865939 (or 9865937 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 44.

The spelling of 72540412663220 in words is "seventy-two trillion, five hundred forty billion, four hundred twelve million, six hundred sixty-three thousand, two hundred twenty".