71660765 has 16 divisors (see below), whose sum is σ = 94101696. Its totient is φ = 51955200.

The previous prime is 71660737. The next prime is 71660779. The reversal of 71660765 is 56706617.

It is not a de Polignac number, because 71660765 - 2²² = 67466461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17570 + ... + 21260.

It is an arithmetic number, because the mean of its divisors is an integer number (5881356).

Almost surely, 2^71660765 is an apocalyptic number.

It is an amenable number.

71660765 is a deficient number, since it is larger than the sum of its proper divisors (22440931).

71660765 is a wasteful number, since it uses less digits than its factorization.

71660765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 71660765 is about 8465.2681587768. The cubic root of 71660765 is about 415.3623679698.

The spelling of 71660765 in words is "seventy-one million, six hundred sixty thousand, seven hundred sixty-five".