71899999 has 8 divisors (see below), whose sum is σ = 73697360. Its totient is φ = 70108416.

The previous prime is 71899973. The next prime is 71900051. The reversal of 71899999 is 99999817.

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 71899999 - 2⁵ = 71899967 is a prime.

It is a Duffinian number.

71899999 is a modest number, since divided by 9999 gives 7189 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71899939) 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, 34639 + ... + 36655.

It is an arithmetic number, because the mean of its divisors is an integer number (9212170).

Almost surely, 2^71899999 is an apocalyptic number.

71899999 is a deficient number, since it is larger than the sum of its proper divisors (1797361).

71899999 is a wasteful number, since it uses less digits than its factorization.

71899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889.

The product of its digits is 3306744, while the sum is 61.

The square root of 71899999 is about 8479.3867113135. The cubic root of 71899999 is about 415.8240730929.

The spelling of 71899999 in words is "seventy-one million, eight hundred ninety-nine thousand, nine hundred ninety-nine".