2087638249 has 4 divisors (see below), whose sum is σ = 2087998164. Its totient is φ = 2087278336.

The previous prime is 2087638237. The next prime is 2087638291. The reversal of 2087638249 is 9428367802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1497148249 + 590490000 = 38693^2 + 24300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2087638249 - 2⁹ = 2087637737 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2087638849) 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 3 ways as a sum of consecutive naturals, for example, 171112 + ... + 182905.

It is an arithmetic number, because the mean of its divisors is an integer number (521999541).

Almost surely, 2^2087638249 is an apocalyptic number.

It is an amenable number.

2087638249 is a deficient number, since it is larger than the sum of its proper divisors (359915).

2087638249 is an equidigital number, since it uses as much as digits as its factorization.

2087638249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359914.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 2087638249 is about 45690.6801109373. The cubic root of 2087638249 is about 1278.0614880825.

The spelling of 2087638249 in words is "two billion, eighty-seven million, six hundred thirty-eight thousand, two hundred forty-nine".