87765138194 has 8 divisors (see below), whose sum is σ = 135205753548. Its totient is φ = 42696553680.

The previous prime is 87765138193. The next prime is 87765138269. The reversal of 87765138194 is 49183156778.

It can be written as a sum of positive squares in 2 ways, for example, as 78351287569 + 9413850625 = 279913^2 + 97025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (87765138193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593007617 + ... + 593007764.

Almost surely, 2^87765138194 is an apocalyptic number.

87765138194 is a deficient number, since it is larger than the sum of its proper divisors (47440615354).

87765138194 is a wasteful number, since it uses less digits than its factorization.

87765138194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186015420.

The product of its digits is 10160640, while the sum is 59.

The spelling of 87765138194 in words is "eighty-seven billion, seven hundred sixty-five million, one hundred thirty-eight thousand, one hundred ninety-four".