72738903081 has 16 divisors (see below), whose sum is σ = 104718329856. Its totient is φ = 44645519616.

The previous prime is 72738903077. The next prime is 72738903089. The reversal of 72738903081 is 18030983727.

It is not a de Polignac number, because 72738903081 - 2² = 72738903077 is a prime.

It is a super-2 number, since 2×72738903081² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72738903081.

It is not an unprimeable number, because it can be changed into a prime (72738903089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2419920 + ... + 2449793.

It is an arithmetic number, because the mean of its divisors is an integer number (6544895616).

Almost surely, 2^72738903081 is an apocalyptic number.

It is an amenable number.

72738903081 is a deficient number, since it is larger than the sum of its proper divisors (31979426775).

72738903081 is a wasteful number, since it uses less digits than its factorization.

72738903081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4870112.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 72738903081 in words is "seventy-two billion, seven hundred thirty-eight million, nine hundred three thousand, eighty-one".