71117990 has 8 divisors (see below), whose sum is σ = 128012400. Its totient is φ = 28447192.

The previous prime is 71117983. The next prime is 71117993. The reversal of 71117990 is 9971117.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 71117990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71117993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3555890 + ... + 3555909.

It is an arithmetic number, because the mean of its divisors is an integer number (16001550).

Almost surely, 2^71117990 is an apocalyptic number.

71117990 is a deficient number, since it is larger than the sum of its proper divisors (56894410).

71117990 is a wasteful number, since it uses less digits than its factorization.

71117990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111806.

The product of its (nonzero) digits is 3969, while the sum is 35.

The square root of 71117990 is about 8433.1482851898. The cubic root of 71117990 is about 414.3110259718.

The spelling of 71117990 in words is "seventy-one million, one hundred seventeen thousand, nine hundred ninety".