78542113 has 4 divisors (see below), whose sum is σ = 84583828. Its totient is φ = 72500400.

The previous prime is 78542099. The next prime is 78542201. The reversal of 78542113 is 31124587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31124587 = 13 ⋅2394199.

It can be written as a sum of positive squares in 2 ways, for example, as 47983329 + 30558784 = 6927^2 + 5528^2 .

It is a cyclic number.

It is not a de Polignac number, because 78542113 - 2⁵ = 78542081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78542213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3020838 + ... + 3020863.

It is an arithmetic number, because the mean of its divisors is an integer number (21145957).

Almost surely, 2^78542113 is an apocalyptic number.

It is an amenable number.

78542113 is a deficient number, since it is larger than the sum of its proper divisors (6041715).

78542113 is a wasteful number, since it uses less digits than its factorization.

78542113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041714.

The product of its digits is 6720, while the sum is 31.

The square root of 78542113 is about 8862.3988287596. The cubic root of 78542113 is about 428.2534400930.

The spelling of 78542113 in words is "seventy-eight million, five hundred forty-two thousand, one hundred thirteen".