71671998 has 16 divisors (see below), whose sum is σ = 143709840. Its totient is φ = 23829696.

The previous prime is 71671991. The next prime is 71672023. The reversal of 71671998 is 89917617.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71671991) 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, 12663 + ... + 17426.

It is an arithmetic number, because the mean of its divisors is an integer number (8981865).

Almost surely, 2^71671998 is an apocalyptic number.

71671998 is an abundant number, since it is smaller than the sum of its proper divisors (72037842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71671998 is a wasteful number, since it uses less digits than its factorization.

71671998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30491.

The product of its digits is 190512, while the sum is 48.

The square root of 71671998 is about 8465.9316085118. The cubic root of 71671998 is about 415.3840698579.

The spelling of 71671998 in words is "seventy-one million, six hundred seventy-one thousand, nine hundred ninety-eight".