87686787 has 8 divisors (see below), whose sum is σ = 121999104. Its totient is φ = 55916168.

The previous prime is 87686779. The next prime is 87686791. The reversal of 87686787 is 78768678.

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

It is a cyclic number.

It is not a de Polignac number, because 87686787 - 2³ = 87686779 is a prime.

It is a super-2 number, since 2×87686787² = 15377945228766738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87686777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635343 + ... + 635480.

It is an arithmetic number, because the mean of its divisors is an integer number (15249888).

Almost surely, 2^87686787 is an apocalyptic number.

87686787 is a deficient number, since it is larger than the sum of its proper divisors (34312317).

87686787 is a wasteful number, since it uses less digits than its factorization.

87686787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270849.

The product of its digits is 6322176, while the sum is 57.

The square root of 87686787 is about 9364.1223294017. The cubic root of 87686787 is about 444.2676790646.

The spelling of 87686787 in words is "eighty-seven million, six hundred eighty-six thousand, seven hundred eighty-seven".