72128715652 has 24 divisors (see below), whose sum is σ = 144610161920. Its totient is φ = 30836721600.

The previous prime is 72128715587. The next prime is 72128715677. The reversal of 72128715652 is 25651782127.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3137724 + ... + 3160627.

Almost surely, 2^72128715652 is an apocalyptic number.

It is an amenable number.

72128715652 is an abundant number, since it is smaller than the sum of its proper divisors (72481446268).

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

72128715652 is a wasteful number, since it uses less digits than its factorization.

72128715652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6298771 (or 6298769 counting only the distinct ones).

The product of its digits is 470400, while the sum is 46.

The spelling of 72128715652 in words is "seventy-two billion, one hundred twenty-eight million, seven hundred fifteen thousand, six hundred fifty-two".