1144636887 has 16 divisors (see below), whose sum is σ = 1543276800. Its totient is φ = 754570752.

The previous prime is 1144636789. The next prime is 1144636891. The reversal of 1144636887 is 7886364411.

It is not a de Polignac number, because 1144636887 - 2²⁷ = 1010419159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144636897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189303 + ... + 195255.

It is an arithmetic number, because the mean of its divisors is an integer number (96454800).

Almost surely, 2^1144636887 is an apocalyptic number.

1144636887 is a deficient number, since it is larger than the sum of its proper divisors (398639913).

1144636887 is a wasteful number, since it uses less digits than its factorization.

1144636887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662.

The product of its digits is 774144, while the sum is 48.

The square root of 1144636887 is about 33832.4827200133. The cubic root of 1144636887 is about 1046.0583546638.

The spelling of 1144636887 in words is "one billion, one hundred forty-four million, six hundred thirty-six thousand, eight hundred eighty-seven".