71978983 has 4 divisors (see below), whose sum is σ = 75108528. Its totient is φ = 68849440.

The previous prime is 71978981. The next prime is 71979001. The reversal of 71978983 is 38987917.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71978983 - 2¹ = 71978981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71978983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71978981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1564738 + ... + 1564783.

It is an arithmetic number, because the mean of its divisors is an integer number (18777132).

Almost surely, 2^71978983 is an apocalyptic number.

71978983 is a deficient number, since it is larger than the sum of its proper divisors (3129545).

71978983 is a wasteful number, since it uses less digits than its factorization.

71978983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129544.

The product of its digits is 762048, while the sum is 52.

The square root of 71978983 is about 8484.0428452478. The cubic root of 71978983 is about 415.9762818547.

The spelling of 71978983 in words is "seventy-one million, nine hundred seventy-eight thousand, nine hundred eighty-three".