78630311 has 4 divisors (see below), whose sum is σ = 79351800. Its totient is φ = 77908824.

The previous prime is 78630301. The next prime is 78630313. The reversal of 78630311 is 11303687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11303687 = 83 ⋅136189.

It is a cyclic number.

It is not a de Polignac number, because 78630311 - 2⁶ = 78630247 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 (78630313) 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 3 ways as a sum of consecutive naturals, for example, 360581 + ... + 360798.

It is an arithmetic number, because the mean of its divisors is an integer number (19837950).

Almost surely, 2^78630311 is an apocalyptic number.

78630311 is a deficient number, since it is larger than the sum of its proper divisors (721489).

78630311 is a wasteful number, since it uses less digits than its factorization.

78630311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721488.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 78630311 is about 8867.3733991526. The cubic root of 78630311 is about 428.4136809543.

Adding to 78630311 its reverse (11303687), we get a palindrome (89933998).

The spelling of 78630311 in words is "seventy-eight million, six hundred thirty thousand, three hundred eleven".