1288328831 has 8 divisors (see below), whose sum is σ = 1357655904. Its totient is φ = 1220111200.

The previous prime is 1288328827. The next prime is 1288328837. The reversal of 1288328831 is 1388238821.

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

It is a cyclic number.

It is not a de Polignac number, because 1288328831 - 2² = 1288328827 is a prime.

It is a super-2 number, since 2×1288328831² = 3319582353571653122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288328837) 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, 274976 + ... + 279621.

It is an arithmetic number, because the mean of its divisors is an integer number (169706988).

Almost surely, 2^1288328831 is an apocalyptic number.

1288328831 is a deficient number, since it is larger than the sum of its proper divisors (69327073).

1288328831 is a wasteful number, since it uses less digits than its factorization.

1288328831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554721.

The product of its digits is 147456, while the sum is 44.

The square root of 1288328831 is about 35893.2978562851. The cubic root of 1288328831 is about 1088.1169493731.

It can be divided in two parts, 12883 and 28831, that added together give a palindrome (41714).

The spelling of 1288328831 in words is "one billion, two hundred eighty-eight million, three hundred twenty-eight thousand, eight hundred thirty-one".