71764985 has 4 divisors (see below), whose sum is σ = 86117988. Its totient is φ = 57411984.

The previous prime is 71764981. The next prime is 71765011. The reversal of 71764985 is 58946717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58946717 = 31 ⋅1901507.

It can be written as a sum of positive squares in 2 ways, for example, as 38402809 + 33362176 = 6197^2 + 5776^2 .

It is a cyclic number.

It is not a de Polignac number, because 71764985 - 2² = 71764981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71764981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7176494 + ... + 7176503.

It is an arithmetic number, because the mean of its divisors is an integer number (21529497).

Almost surely, 2^71764985 is an apocalyptic number.

It is an amenable number.

71764985 is a deficient number, since it is larger than the sum of its proper divisors (14353003).

71764985 is a wasteful number, since it uses less digits than its factorization.

71764985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14353002.

The product of its digits is 423360, while the sum is 47.

The square root of 71764985 is about 8471.4216634518. The cubic root of 71764985 is about 415.5636315068.

The spelling of 71764985 in words is "seventy-one million, seven hundred sixty-four thousand, nine hundred eighty-five".