71856978 has 16 divisors (see below), whose sum is σ = 145534080. Its totient is φ = 23648976.

The previous prime is 71856971. The next prime is 71856979. The reversal of 71856978 is 87965817.

It is a self number, because there is not a number n which added to its sum of digits gives 71856978.

It is not an unprimeable number, because it can be changed into a prime (71856971) 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 7 ways as a sum of consecutive naturals, for example, 75325 + ... + 76272.

It is an arithmetic number, because the mean of its divisors is an integer number (9095880).

Almost surely, 2^71856978 is an apocalyptic number.

71856978 is an abundant number, since it is smaller than the sum of its proper divisors (73677102).

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

71856978 is a wasteful number, since it uses less digits than its factorization.

71856978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151681.

The product of its digits is 846720, while the sum is 51.

The square root of 71856978 is about 8476.8495326979. The cubic root of 71856978 is about 415.7411211372.

The spelling of 71856978 in words is "seventy-one million, eight hundred fifty-six thousand, nine hundred seventy-eight".