18787362489 has 81 divisors (see below), whose sum is σ = 32396617071. Its totient is φ = 10460953440.

The previous prime is 18787362457. The next prime is 18787362493. The reversal of 18787362489 is 98426378781.

The square root of 18787362489 is 137067.

It is a perfect power (a square), and thus also a powerful number.

18787362489 is a `hidden beast` number, since 1 + 87 + 8 + 73 + 6 + 2 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 610930089 + 18176432400 = 24717^2 + 134820^2 .

It is not a de Polignac number, because 18787362489 - 2⁵ = 18787362457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (18787362449) 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 80 ways as a sum of consecutive naturals, for example, 175582774 + ... + 175582880.

Almost surely, 2^18787362489 is an apocalyptic number.

18787362489 is the 137067-th square number.

18787362489 is the 68534-th centered octagonal number.

It is an amenable number.

18787362489 is a deficient number, since it is larger than the sum of its proper divisors (13609254582).

18787362489 is an equidigital number, since it uses as much as digits as its factorization.

18787362489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 178 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 18787362489 in words is "eighteen billion, seven hundred eighty-seven million, three hundred sixty-two thousand, four hundred eighty-nine".