71878578 has 8 divisors (see below), whose sum is σ = 143757168. Its totient is φ = 23959524.

The previous prime is 71878561. The next prime is 71878589. The reversal of 71878578 is 87587817.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

71878578 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 71878578.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5989876 + ... + 5989887.

It is an arithmetic number, because the mean of its divisors is an integer number (17969646).

Almost surely, 2^71878578 is an apocalyptic number.

71878578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71878578 is a wasteful number, since it uses less digits than its factorization.

71878578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11979768.

The product of its digits is 878080, while the sum is 51.

The square root of 71878578 is about 8478.1234952081. The cubic root of 71878578 is about 415.7827738239.

The spelling of 71878578 in words is "seventy-one million, eight hundred seventy-eight thousand, five hundred seventy-eight".