78318911 has 4 divisors (see below), whose sum is σ = 85438824. Its totient is φ = 71199000.

The previous prime is 78318907. The next prime is 78318923. The reversal of 78318911 is 11981387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11981387 = 11 ⋅1089217.

It is a cyclic number.

It is not a de Polignac number, because 78318911 - 2² = 78318907 is a prime.

It is a super-2 number, since 2×78318911² = 12267703640451842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78318811) 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, 3559940 + ... + 3559961.

It is an arithmetic number, because the mean of its divisors is an integer number (21359706).

Almost surely, 2^78318911 is an apocalyptic number.

78318911 is a deficient number, since it is larger than the sum of its proper divisors (7119913).

78318911 is a wasteful number, since it uses less digits than its factorization.

78318911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7119912.

The product of its digits is 12096, while the sum is 38.

The square root of 78318911 is about 8849.7972293155. The cubic root of 78318911 is about 427.8473831353.

The spelling of 78318911 in words is "seventy-eight million, three hundred eighteen thousand, nine hundred eleven".