71279999 has 8 divisors (see below), whose sum is σ = 84272160. Its totient is φ = 58990176.

The previous prime is 71279993. The next prime is 71280007. The reversal of 71279999 is 99997217.

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

It is not a de Polignac number, because 71279999 - 2¹² = 71275903 is a prime.

71279999 is a modest number, since divided by 9999 gives 7127 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 71279999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71279993) 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, 175364 + ... + 175769.

It is an arithmetic number, because the mean of its divisors is an integer number (10534020).

Almost surely, 2^71279999 is an apocalyptic number.

71279999 is a deficient number, since it is larger than the sum of its proper divisors (12992161).

71279999 is a wasteful number, since it uses less digits than its factorization.

71279999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351169.

The product of its digits is 642978, while the sum is 53.

The square root of 71279999 is about 8442.7483084598. The cubic root of 71279999 is about 414.6253918617.

The spelling of 71279999 in words is "seventy-one million, two hundred seventy-nine thousand, nine hundred ninety-nine".