87778028646386 has 8 divisors (see below), whose sum is σ = 141795277044204. Its totient is φ = 40512936298320.

The previous prime is 87778028646299. The next prime is 87778028646391. The reversal of 87778028646386 is 68364682087778.

It can be written as a sum of positive squares in 2 ways, for example, as 87561402630625 + 216626015761 = 9357425^2 + 465431^2 .

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

It is a super-2 number, since 2×87778028646386² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87778028646386.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688039012405 + ... + 1688039012456.

Almost surely, 2^{87778028646386} is an apocalyptic number.

87778028646386 is a deficient number, since it is larger than the sum of its proper divisors (54017248397818).

87778028646386 is a wasteful number, since it uses less digits than its factorization.

87778028646386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376078024876.

The product of its (nonzero) digits is 7283146752, while the sum is 80.

The spelling of 87778028646386 in words is "eighty-seven trillion, seven hundred seventy-eight billion, twenty-eight million, six hundred forty-six thousand, three hundred eighty-six".