78312311 has 8 divisors (see below), whose sum is σ = 97636224. Its totient is φ = 61022520.

The previous prime is 78312307. The next prime is 78312317. The reversal of 78312311 is 11321387.

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

It is a cyclic number.

It is not a de Polignac number, because 78312311 - 2² = 78312307 is a prime.

It is a super-2 number, since 2×78312311² = 12265636108321442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78312317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508445 + ... + 508598.

It is an arithmetic number, because the mean of its divisors is an integer number (12204528).

Almost surely, 2^78312311 is an apocalyptic number.

78312311 is a deficient number, since it is larger than the sum of its proper divisors (19323913).

78312311 is a wasteful number, since it uses less digits than its factorization.

78312311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017061.

The product of its digits is 1008, while the sum is 26.

The square root of 78312311 is about 8849.4243315597. The cubic root of 78312311 is about 427.8353644456.

Adding to 78312311 its reverse (11321387), we get a palindrome (89633698).

The spelling of 78312311 in words is "seventy-eight million, three hundred twelve thousand, three hundred eleven".