1287671535 has 12 divisors (see below), whose sum is σ = 2231964072. Its totient is φ = 686758128.

The previous prime is 1287671479. The next prime is 1287671557. The reversal of 1287671535 is 5351767821.

It is a happy number.

It is not a de Polignac number, because 1287671535 - 2⁸ = 1287671279 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 28614923 = 1287671535 / (1 + 2 + 8 + 7 + 6 + 7 + 1 + 5 + 3 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14307417 + ... + 14307506.

It is an arithmetic number, because the mean of its divisors is an integer number (185997006).

Almost surely, 2^1287671535 is an apocalyptic number.

1287671535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287671535 is a deficient number, since it is larger than the sum of its proper divisors (944292537).

1287671535 is a wasteful number, since it uses less digits than its factorization.

1287671535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28614934 (or 28614931 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 1287671535 is about 35884.1404383608. The cubic root of 1287671535 is about 1087.9318681091.

It can be divided in two parts, 12876 and 71535, that multiplied together give a triangular number (921084660 = T₄₂₉₂₀).

The spelling of 1287671535 in words is "one billion, two hundred eighty-seven million, six hundred seventy-one thousand, five hundred thirty-five".