72131352440 has 32 divisors (see below), whose sum is σ = 185480621280. Its totient is φ = 24730749312.

The previous prime is 72131352421. The next prime is 72131352473. The reversal of 72131352440 is 4425313127.

It is a junction number, because it is equal to n+sod(n) for n = 72131352397 and 72131352406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128805707 + ... + 128806266.

It is an arithmetic number, because the mean of its divisors is an integer number (5796269415).

Almost surely, 2^72131352440 is an apocalyptic number.

72131352440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

72131352440 is an abundant number, since it is smaller than the sum of its proper divisors (113349268840).

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

72131352440 is a wasteful number, since it uses less digits than its factorization.

72131352440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257611991 (or 257611987 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

Adding to 72131352440 its reverse (4425313127), we get a palindrome (76556665567).

The spelling of 72131352440 in words is "seventy-two billion, one hundred thirty-one million, three hundred fifty-two thousand, four hundred forty".