78838311 has 4 divisors (see below), whose sum is σ = 105117752. Its totient is φ = 52558872.

The previous prime is 78838267. The next prime is 78838339. The reversal of 78838311 is 11383887.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78838311 - 2¹³ = 78830119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78838311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78838381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13139716 + ... + 13139721.

It is an arithmetic number, because the mean of its divisors is an integer number (26279438).

Almost surely, 2^78838311 is an apocalyptic number.

78838311 is a deficient number, since it is larger than the sum of its proper divisors (26279441).

78838311 is a wasteful number, since it uses less digits than its factorization.

78838311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26279440.

The product of its digits is 32256, while the sum is 39.

The square root of 78838311 is about 8879.0940416238. The cubic root of 78838311 is about 428.7911078685.

The spelling of 78838311 in words is "seventy-eight million, eight hundred thirty-eight thousand, three hundred eleven".