78987369 has 4 divisors (see below), whose sum is σ = 105316496. Its totient is φ = 52658244.

The previous prime is 78987323. The next prime is 78987379. The reversal of 78987369 is 96378987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78987369 - 2¹¹ = 78985321 is a prime.

It is a super-2 number, since 2×78987369² = 12478008923084322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78987319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13164559 + ... + 13164564.

It is an arithmetic number, because the mean of its divisors is an integer number (26329124).

Almost surely, 2^78987369 is an apocalyptic number.

It is an amenable number.

78987369 is a deficient number, since it is larger than the sum of its proper divisors (26329127).

78987369 is a wasteful number, since it uses less digits than its factorization.

78987369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26329126.

The product of its digits is 4572288, while the sum is 57.

The square root of 78987369 is about 8887.4838396478. The cubic root of 78987369 is about 429.0611732958.

The spelling of 78987369 in words is "seventy-eight million, nine hundred eighty-seven thousand, three hundred sixty-nine".