87757275778 has 4 divisors (see below), whose sum is σ = 131635913670. Its totient is φ = 43878637888.

The previous prime is 87757275773. The next prime is 87757275803.

87757275778 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., 70011572409 + 17745703369 = 264597^2 + 133213^2 .

It is a super-3 number, since 3×87757275778³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (87757275773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21939318943 + ... + 21939318946.

Almost surely, 2^87757275778 is an apocalyptic number.

87757275778 is a deficient number, since it is larger than the sum of its proper divisors (43878637892).

87757275778 is a wasteful number, since it uses less digits than its factorization.

87757275778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43878637891.

The product of its digits is 376476800, while the sum is 70.

The spelling of 87757275778 in words is "eighty-seven billion, seven hundred fifty-seven million, two hundred seventy-five thousand, seven hundred seventy-eight".