71979983 has 8 divisors (see below), whose sum is σ = 74167488. Its totient is φ = 69819904.

The previous prime is 71979977. The next prime is 71980009. The reversal of 71979983 is 38997917.

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

It is a cyclic number.

It is not a de Polignac number, because 71979983 - 2¹² = 71975887 is a prime.

It is a super-2 number, since 2×71979983² = 10362235905360578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71979953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1466 + ... + 12087.

It is an arithmetic number, because the mean of its divisors is an integer number (9270936).

Almost surely, 2^71979983 is an apocalyptic number.

71979983 is a deficient number, since it is larger than the sum of its proper divisors (2187505).

71979983 is a wasteful number, since it uses less digits than its factorization.

71979983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13713.

The product of its digits is 857304, while the sum is 53.

The square root of 71979983 is about 8484.1017792103. The cubic root of 71979983 is about 415.9782082242.

The spelling of 71979983 in words is "seventy-one million, nine hundred seventy-nine thousand, nine hundred eighty-three".