78987705 has 8 divisors (see below), whose sum is σ = 126380352. Its totient is φ = 42126768.

The previous prime is 78987703. The next prime is 78987709. The reversal of 78987705 is 50778987.

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

It is not a de Polignac number, because 78987705 - 2¹ = 78987703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78987703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2632909 + ... + 2632938.

It is an arithmetic number, because the mean of its divisors is an integer number (15797544).

Almost surely, 2^78987705 is an apocalyptic number.

It is an amenable number.

78987705 is a deficient number, since it is larger than the sum of its proper divisors (47392647).

78987705 is a wasteful number, since it uses less digits than its factorization.

78987705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265855.

The product of its (nonzero) digits is 987840, while the sum is 51.

The square root of 78987705 is about 8887.5027426156. The cubic root of 78987705 is about 429.0617816815.

The spelling of 78987705 in words is "seventy-eight million, nine hundred eighty-seven thousand, seven hundred five".