78134543 has 4 divisors (see below), whose sum is σ = 78446088. Its totient is φ = 77823000.

The previous prime is 78134527. The next prime is 78134549. The reversal of 78134543 is 34543187.

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

It is a cyclic number.

It is not a de Polignac number, because 78134543 - 2⁴ = 78134527 is a prime.

It is a super-2 number, since 2×78134543² = 12210013619637698, 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 (78134549) 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, 155396 + ... + 155897.

It is an arithmetic number, because the mean of its divisors is an integer number (19611522).

Almost surely, 2^78134543 is an apocalyptic number.

78134543 is a deficient number, since it is larger than the sum of its proper divisors (311545).

78134543 is a wasteful number, since it uses less digits than its factorization.

78134543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311544.

The product of its digits is 40320, while the sum is 35.

The square root of 78134543 is about 8839.3745819487. The cubic root of 78134543 is about 427.5113921477.

The spelling of 78134543 in words is "seventy-eight million, one hundred thirty-four thousand, five hundred forty-three".