2288761281 has 27 divisors (see below), whose sum is σ = 3405656163. Its totient is φ = 1481157360.

The previous prime is 2288761259. The next prime is 2288761309. The reversal of 2288761281 is 1821678822.

It is a happy number.

The square root of 2288761281 is 47841.

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

2288761281 is a `hidden beast` number, since 2 + 28 + 8 + 7 + 612 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2048015025 + 240746256 = 45255^2 + 15516^2 .

It is not a de Polignac number, because 2288761281 - 2⁹ = 2288760769 is a prime.

It is a super-2 number, since 2×2288761281² = 10476856402809521922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2288761681) 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, 5310136 + ... + 5310566.

Almost surely, 2^2288761281 is an apocalyptic number.

2288761281 is the 47841-st square number.

2288761281 is the 23921-st centered octagonal number.

It is an amenable number.

2288761281 is a deficient number, since it is larger than the sum of its proper divisors (1116894882).

2288761281 is an frugal number, since it uses more digits than its factorization.

2288761281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 471 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The cubic root of 2288761281 is about 1317.8525845166.

The spelling of 2288761281 in words is "two billion, two hundred eighty-eight million, seven hundred sixty-one thousand, two hundred eighty-one".