78118543 has 4 divisors (see below), whose sum is σ = 80638528. Its totient is φ = 75598560.

The previous prime is 78118517. The next prime is 78118549. The reversal of 78118543 is 34581187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34581187 = 2683 ⋅12889.

It is a cyclic number.

It is not a de Polignac number, because 78118543 - 2⁹ = 78118031 is a prime.

It is a super-2 number, since 2×78118543² = 12205013520885698, 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 (78118549) 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, 1259946 + ... + 1260007.

It is an arithmetic number, because the mean of its divisors is an integer number (20159632).

Almost surely, 2^78118543 is an apocalyptic number.

78118543 is a deficient number, since it is larger than the sum of its proper divisors (2519985).

78118543 is a wasteful number, since it uses less digits than its factorization.

78118543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519984.

The product of its digits is 26880, while the sum is 37.

The square root of 78118543 is about 8838.4694942054. The cubic root of 78118543 is about 427.4822089424.

The spelling of 78118543 in words is "seventy-eight million, one hundred eighteen thousand, five hundred forty-three".