1161728272 has 20 divisors (see below), whose sum is σ = 2256646860. Its totient is φ = 579367808.

The previous prime is 1161728263. The next prime is 1161728311. The reversal of 1161728272 is 2728271611.

It can be written as a sum of positive squares in 2 ways, for example, as 277022736 + 884705536 = 16644^2 + 29744^2 .

It is a super-2 number, since 2×1161728272² = 2699225155928211968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87103 + ... + 99550.

It is an arithmetic number, because the mean of its divisors is an integer number (112832343).

Almost surely, 2^1161728272 is an apocalyptic number.

It is an amenable number.

1161728272 is a deficient number, since it is larger than the sum of its proper divisors (1094918588).

1161728272 is a wasteful number, since it uses less digits than its factorization.

1161728272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187050 (or 187044 counting only the distinct ones).

The product of its digits is 18816, while the sum is 37.

The square root of 1161728272 is about 34084.1351951315. The cubic root of 1161728272 is about 1051.2391333108.

Adding to 1161728272 its reverse (2728271611), we get a palindrome (3889999883).

The spelling of 1161728272 in words is "one billion, one hundred sixty-one million, seven hundred twenty-eight thousand, two hundred seventy-two".