71887578 has 32 divisors (see below), whose sum is σ = 169983360. Its totient is φ = 19830720.

The previous prime is 71887561. The next prime is 71887579. The reversal of 71887578 is 87578817.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 71887578.

It is not an unprimeable number, because it can be changed into a prime (71887579) 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 15 ways as a sum of consecutive naturals, for example, 28293 + ... + 30728.

It is an arithmetic number, because the mean of its divisors is an integer number (5311980).

Almost surely, 2^71887578 is an apocalyptic number.

71887578 is an abundant number, since it is smaller than the sum of its proper divisors (98095782).

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

71887578 is a wasteful number, since it uses less digits than its factorization.

71887578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59062.

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

The square root of 71887578 is about 8478.6542564254. The cubic root of 71887578 is about 415.8001266472.

The spelling of 71887578 in words is "seventy-one million, eight hundred eighty-seven thousand, five hundred seventy-eight".