1287773055 has 24 divisors (see below), whose sum is σ = 2236616928. Its totient is φ = 685434816.

The previous prime is 1287773023. The next prime is 1287773057. The reversal of 1287773055 is 5503777821.

It is not a de Polignac number, because 1287773055 - 2⁵ = 1287773023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1287773055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287773057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5812 + ... + 51081.

It is an arithmetic number, because the mean of its divisors is an integer number (93192372).

Almost surely, 2^1287773055 is an apocalyptic number.

1287773055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287773055 is a deficient number, since it is larger than the sum of its proper divisors (948843873).

1287773055 is a wasteful number, since it uses less digits than its factorization.

1287773055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57407 (or 57404 counting only the distinct ones).

The product of its (nonzero) digits is 411600, while the sum is 45.

The square root of 1287773055 is about 35885.5549629653. The cubic root of 1287773055 is about 1087.9604582006.

The spelling of 1287773055 in words is "one billion, two hundred eighty-seven million, seven hundred seventy-three thousand, fifty-five".