72448720569 has 27 divisors (see below), whose sum is σ = 108700271173. Its totient is φ = 48284612244.

The previous prime is 72448720567. The next prime is 72448720601. The reversal of 72448720569 is 96502784427.

The square root of 72448720569 is 269163.

It is a perfect power (a square), and thus also a powerful number.

72448720569 is a `hidden beast` number, since 7 + 2 + 4 + 4 + 8 + 72 + 0 + 569 = 666.

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 72448720569 - 2¹ = 72448720567 is a prime.

It is a super-2 number, since 2×72448720569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72448720567) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21800542 + ... + 21803864.

Almost surely, 2^72448720569 is an apocalyptic number.

72448720569 is the 269163-rd square number.

72448720569 is the 134582-nd centered octagonal number.

It is an amenable number.

72448720569 is a deficient number, since it is larger than the sum of its proper divisors (36251550604).

72448720569 is an frugal number, since it uses more digits than its factorization.

72448720569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670 (or 3326 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 72448720569 in words is "seventy-two billion, four hundred forty-eight million, seven hundred twenty thousand, five hundred sixty-nine".