71978984 has 32 divisors (see below), whose sum is σ = 168264000. Its totient is φ = 28043520.

The previous prime is 71978981. The next prime is 71979001. The reversal of 71978984 is 48987917.

It is not an unprimeable number, because it can be changed into a prime (71978981) 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 7 ways as a sum of consecutive naturals, for example, 57809 + ... + 59040.

It is an arithmetic number, because the mean of its divisors is an integer number (5258250).

Almost surely, 2^71978984 is an apocalyptic number.

It is an amenable number.

71978984 is an abundant number, since it is smaller than the sum of its proper divisors (96285016).

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

71978984 is a wasteful number, since it uses less digits than its factorization.

71978984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116873 (or 116869 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 53.

The square root of 71978984 is about 8484.0429041819. The cubic root of 71978984 is about 415.9762837811.

The spelling of 71978984 in words is "seventy-one million, nine hundred seventy-eight thousand, nine hundred eighty-four".