78134818 has 32 divisors (see below), whose sum is σ = 127411200. Its totient is φ = 35830080.

The previous prime is 78134813. The next prime is 78134843. The reversal of 78134818 is 81843187.

It is a super-2 number, since 2×78134818² = 12210099567786248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (78134813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223708 + ... + 224056.

It is an arithmetic number, because the mean of its divisors is an integer number (3981600).

Almost surely, 2^78134818 is an apocalyptic number.

78134818 is a deficient number, since it is larger than the sum of its proper divisors (49276382).

78134818 is a wasteful number, since it uses less digits than its factorization.

78134818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562.

The product of its digits is 43008, while the sum is 40.

The square root of 78134818 is about 8839.3901373341. The cubic root of 78134818 is about 427.5118936992.

The spelling of 78134818 in words is "seventy-eight million, one hundred thirty-four thousand, eight hundred eighteen".