71979871 has 8 divisors (see below), whose sum is σ = 73211904. Its totient is φ = 70754040.

The previous prime is 71979851. The next prime is 71979931. The reversal of 71979871 is 17897917.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71979871 is a prime.

It is a super-2 number, since 2×71979871² = 10362203658353282, 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 (71979851) 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, 25870 + ... + 28516.

It is an arithmetic number, because the mean of its divisors is an integer number (9151488).

Almost surely, 2^71979871 is an apocalyptic number.

71979871 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

71979871 is a deficient number, since it is larger than the sum of its proper divisors (1232033).

71979871 is a wasteful number, since it uses less digits than its factorization.

71979871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101.

The product of its digits is 222264, while the sum is 49.

The square root of 71979871 is about 8484.0951786269. The cubic root of 71979871 is about 415.9779924717.

The spelling of 71979871 in words is "seventy-one million, nine hundred seventy-nine thousand, eight hundred seventy-one".