71998765 has 8 divisors (see below), whose sum is σ = 87439968. Its totient is φ = 56904720.

The previous prime is 71998753. The next prime is 71998769. The reversal of 71998765 is 56789917.

It is a happy number.

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

It is not a de Polignac number, because 71998765 - 2⁹ = 71998253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71998769) 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 7 ways as a sum of consecutive naturals, for example, 86331 + ... + 87160.

It is an arithmetic number, because the mean of its divisors is an integer number (10929996).

Almost surely, 2^71998765 is an apocalyptic number.

It is an amenable number.

71998765 is a deficient number, since it is larger than the sum of its proper divisors (15441203).

71998765 is a wasteful number, since it uses less digits than its factorization.

71998765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173579.

The product of its digits is 952560, while the sum is 52.

The square root of 71998765 is about 8485.2086008536. The cubic root of 71998765 is about 416.0143859824.

The spelling of 71998765 in words is "seventy-one million, nine hundred ninety-eight thousand, seven hundred sixty-five".