1087991544 has 32 divisors (see below), whose sum is σ = 2720880720. Its totient is φ = 362543616.

The previous prime is 1087991533. The next prime is 1087991557. The reversal of 1087991544 is 4451997801.

1087991544 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1087991493 and 1087991502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94822 + ... + 105674.

Almost surely, 2^1087991544 is an apocalyptic number.

It is an amenable number.

1087991544 is an abundant number, since it is smaller than the sum of its proper divisors (1632889176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1087991544 is a wasteful number, since it uses less digits than its factorization.

1087991544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15039 (or 15035 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 1087991544 is about 32984.7168246144. The cubic root of 1087991544 is about 1028.5099717028.

The spelling of 1087991544 in words is "one billion, eighty-seven million, nine hundred ninety-one thousand, five hundred forty-four".