1288267945 has 8 divisors (see below), whose sum is σ = 1546763400. Its totient is φ = 1030053120.

The previous prime is 1288267943. The next prime is 1288268063. The reversal of 1288267945 is 5497628821.

It can be written as a sum of positive squares in 4 ways, for example, as 45846441 + 1242421504 = 6771^2 + 35248^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1288267945 - 2¹ = 1288267943 is a prime.

It is a super-2 number, since 2×1288267945² = 3319268596229046050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1288267892 and 1288267901.

It is not an unprimeable number, because it can be changed into a prime (1288267943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59920 + ... + 78529.

It is an arithmetic number, because the mean of its divisors is an integer number (193345425).

Almost surely, 2^1288267945 is an apocalyptic number.

It is an amenable number.

1288267945 is a deficient number, since it is larger than the sum of its proper divisors (258495455).

1288267945 is a wasteful number, since it uses less digits than its factorization.

1288267945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140315.

The product of its digits is 1935360, while the sum is 52.

The square root of 1288267945 is about 35892.4496934940. The cubic root of 1288267945 is about 1088.0998077525.

The spelling of 1288267945 in words is "one billion, two hundred eighty-eight million, two hundred sixty-seven thousand, nine hundred forty-five".