87718643 has 4 divisors (see below), whose sum is σ = 87765600. Its totient is φ = 87671688.

The previous prime is 87718621. The next prime is 87718651. The reversal of 87718643 is 34681778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34681778 = 2 ⋅17340889.

It is a cyclic number.

It is not a de Polignac number, because 87718643 - 2²⁴ = 70941427 is a prime.

It is a super-2 number, since 2×87718643² = 15389120659522898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87718594 and 87718603.

It is not an unprimeable number, because it can be changed into a prime (87712643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20555 + ... + 24452.

It is an arithmetic number, because the mean of its divisors is an integer number (21941400).

Almost surely, 2^87718643 is an apocalyptic number.

87718643 is a deficient number, since it is larger than the sum of its proper divisors (46957).

87718643 is a wasteful number, since it uses less digits than its factorization.

87718643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46956.

The product of its digits is 225792, while the sum is 44.

The square root of 87718643 is about 9365.8231352081. The cubic root of 87718643 is about 444.3214723371.

The spelling of 87718643 in words is "eighty-seven million, seven hundred eighteen thousand, six hundred forty-three".