87878987 has 4 divisors (see below), whose sum is σ = 100433136. Its totient is φ = 75324840.

The previous prime is 87878981. The next prime is 87879041. The reversal of 87878987 is 78987878.

87878987 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78987878 = 2 ⋅39493939.

It is a cyclic number.

It is not a de Polignac number, because 87878987 - 2¹⁴ = 87862603 is a prime.

It is a super-2 number, since 2×87878987² = 15445432712292338, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87878981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6277064 + ... + 6277077.

It is an arithmetic number, because the mean of its divisors is an integer number (25108284).

Almost surely, 2^87878987 is an apocalyptic number.

87878987 is a deficient number, since it is larger than the sum of its proper divisors (12554149).

87878987 is a wasteful number, since it uses less digits than its factorization.

87878987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12554148.

The product of its digits is 12644352, while the sum is 62.

The square root of 87878987 is about 9374.3792861181. The cubic root of 87878987 is about 444.5920378398.

The spelling of 87878987 in words is "eighty-seven million, eight hundred seventy-eight thousand, nine hundred eighty-seven".