87636386 has 4 divisors (see below), whose sum is σ = 131454582. Its totient is φ = 43818192.

The previous prime is 87636383. The next prime is 87636389. The reversal of 87636386 is 68363678.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68363678 = 2 ⋅34181839.

It is an interprime number because it is at equal distance from previous prime (87636383) and next prime (87636389).

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 29495761 = 7625^2 + 5431^2 .

It is a super-2 number, since 2×87636386² = 15360272302281992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87636386.

It is not an unprimeable number, because it can be changed into a prime (87636383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21909095 + ... + 21909098.

Almost surely, 2^87636386 is an apocalyptic number.

87636386 is a deficient number, since it is larger than the sum of its proper divisors (43818196).

87636386 is a wasteful number, since it uses less digits than its factorization.

87636386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43818195.

The product of its digits is 870912, while the sum is 47.

The square root of 87636386 is about 9361.4307667151. The cubic root of 87636386 is about 444.1825433692.

The spelling of 87636386 in words is "eighty-seven million, six hundred thirty-six thousand, three hundred eighty-six".