87678987 has 16 divisors (see below), whose sum is σ = 128189952. Its totient is φ = 52865120.

The previous prime is 87678971. The next prime is 87678991. The reversal of 87678987 is 78987678.

87678987 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 87678987 - 2⁴ = 87678971 is a prime.

It is a super-2 number, since 2×87678987² = 15375209522692338, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 87678987.

It is not an unprimeable number, because it can be changed into a prime (87678187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243 + ... + 13244.

It is an arithmetic number, because the mean of its divisors is an integer number (8011872).

Almost surely, 2^87678987 is an apocalyptic number.

87678987 is a deficient number, since it is larger than the sum of its proper divisors (40510965).

87678987 is a wasteful number, since it uses less digits than its factorization.

87678987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13698.

The product of its digits is 9483264, while the sum is 60.

The square root of 87678987 is about 9363.7058369003. The cubic root of 87678987 is about 444.2545056977.

The spelling of 87678987 in words is "eighty-seven million, six hundred seventy-eight thousand, nine hundred eighty-seven".