78866887 has 8 divisors (see below), whose sum is σ = 86112000. Its totient is φ = 71634360.

The previous prime is 78866867. The next prime is 78866897.

78866887 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78866887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78866857) 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, 14098 + ... + 18880.

It is an arithmetic number, because the mean of its divisors is an integer number (10764000).

Almost surely, 2^78866887 is an apocalyptic number.

78866887 is a deficient number, since it is larger than the sum of its proper divisors (7245113).

78866887 is a wasteful number, since it uses less digits than its factorization.

78866887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293.

The product of its digits is 7225344, while the sum is 58.

The square root of 78866887 is about 8880.7030690143. The cubic root of 78866887 is about 428.8429086339.

The spelling of 78866887 in words is "seventy-eight million, eight hundred sixty-six thousand, eight hundred eighty-seven".