1287638877 has 32 divisors (see below), whose sum is σ = 2051112960. Its totient is φ = 702535680.

The previous prime is 1287638861. The next prime is 1287638879. The reversal of 1287638877 is 7788367821.

It is not a de Polignac number, because 1287638877 - 2⁴ = 1287638861 is a prime.

It is a super-2 number, since 2×1287638877² = 3316027755123642258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287638879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307524 + ... + 311682.

It is an arithmetic number, because the mean of its divisors is an integer number (64097280).

Almost surely, 2^1287638877 is an apocalyptic number.

It is an amenable number.

1287638877 is a deficient number, since it is larger than the sum of its proper divisors (763474083).

1287638877 is a wasteful number, since it uses less digits than its factorization.

1287638877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4833.

The product of its digits is 6322176, while the sum is 57.

The square root of 1287638877 is about 35883.6853876521. The cubic root of 1287638877 is about 1087.9226706344.

The spelling of 1287638877 in words is "one billion, two hundred eighty-seven million, six hundred thirty-eight thousand, eight hundred seventy-seven".