67878987 has 32 divisors (see below), whose sum is σ = 101122560. Its totient is φ = 40158720.

The previous prime is 67878971. The next prime is 67878991. The reversal of 67878987 is 78987876.

67878987 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 67878987 - 2⁴ = 67878971 is a prime.

It is a super-2 number, since 2×67878987² = 9215113752292338, 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 67878987.

It is not an unprimeable number, because it can be changed into a prime (67878947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406378 + ... + 406544.

It is an arithmetic number, because the mean of its divisors is an integer number (3160080).

Almost surely, 2^67878987 is an apocalyptic number.

67878987 is a deficient number, since it is larger than the sum of its proper divisors (33243573).

67878987 is a wasteful number, since it uses less digits than its factorization.

67878987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403.

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

The square root of 67878987 is about 8238.8704929741. The cubic root of 67878987 is about 407.9232422405.

Subtracting 67878987 from its reverse (78987876), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 678789 and 87, that added together give a palindrome (678876).

The spelling of 67878987 in words is "sixty-seven million, eight hundred seventy-eight thousand, nine hundred eighty-seven".