78411878 has 4 divisors (see below), whose sum is σ = 117617820. Its totient is φ = 39205938.

The previous prime is 78411859. The next prime is 78411881. The reversal of 78411878 is 87811487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87811487 = 647 ⋅135721.

It is a super-2 number, since 2×78411878² = 12296845222973768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19602968 + ... + 19602971.

It is an arithmetic number, because the mean of its divisors is an integer number (29404455).

Almost surely, 2^78411878 is an apocalyptic number.

78411878 is a deficient number, since it is larger than the sum of its proper divisors (39205942).

78411878 is a wasteful number, since it uses less digits than its factorization.

78411878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39205941.

The product of its digits is 100352, while the sum is 44.

The square root of 78411878 is about 8855.0481647476. The cubic root of 78411878 is about 428.0166056095.

The spelling of 78411878 in words is "seventy-eight million, four hundred eleven thousand, eight hundred seventy-eight".