1287328144 has 10 divisors (see below), whose sum is σ = 2494198310. Its totient is φ = 643664064.

The previous prime is 1287328117. The next prime is 1287328171. The reversal of 1287328144 is 4418237821.

It is an interprime number because it is at equal distance from previous prime (1287328117) and next prime (1287328171).

It can be written as a sum of positive squares in only one way, i.e., 820249600 + 467078544 = 28640^2 + 21612^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1287328097 and 1287328106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40228989 + ... + 40229020.

It is an arithmetic number, because the mean of its divisors is an integer number (249419831).

Almost surely, 2^1287328144 is an apocalyptic number.

It is an amenable number.

1287328144 is a deficient number, since it is larger than the sum of its proper divisors (1206870166).

1287328144 is an equidigital number, since it uses as much as digits as its factorization.

1287328144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80458017 (or 80458011 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 1287328144 is about 35879.3554011217. The cubic root of 1287328144 is about 1087.8351510982.

The spelling of 1287328144 in words is "one billion, two hundred eighty-seven million, three hundred twenty-eight thousand, one hundred forty-four".