72517004420 has 24 divisors (see below), whose sum is σ = 174040810944. Its totient is φ = 24862972896.

The previous prime is 72517004419. The next prime is 72517004429. The reversal of 72517004420 is 2440071527.

It is not an unprimeable number, because it can be changed into a prime (72517004429) 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, 258989162 + ... + 258989441.

It is an arithmetic number, because the mean of its divisors is an integer number (7251700456).

Almost surely, 2^72517004420 is an apocalyptic number.

72517004420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

72517004420 is an abundant number, since it is smaller than the sum of its proper divisors (101523806524).

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

72517004420 is a wasteful number, since it uses less digits than its factorization.

72517004420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517978619 (or 517978617 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 32.

Adding to 72517004420 its reverse (2440071527), we get a palindrome (74957075947).

The spelling of 72517004420 in words is "seventy-two billion, five hundred seventeen million, four thousand, four hundred twenty".