87579897578 has 4 divisors (see below), whose sum is σ = 131369846370. Its totient is φ = 43789948788.

The previous prime is 87579897571. The next prime is 87579897589.

87579897578 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 75931660249 + 11648237329 = 275557^2 + 107927^2 .

It is not an unprimeable number, because it can be changed into a prime (87579897571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21894974393 + ... + 21894974396.

Almost surely, 2^87579897578 is an apocalyptic number.

87579897578 is a deficient number, since it is larger than the sum of its proper divisors (43789948792).

87579897578 is a wasteful number, since it uses less digits than its factorization.

87579897578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43789948791.

The product of its digits is 2489356800, while the sum is 80.

The spelling of 87579897578 in words is "eighty-seven billion, five hundred seventy-nine million, eight hundred ninety-seven thousand, five hundred seventy-eight".