71764321 has 4 divisors (see below), whose sum is σ = 71842500. Its totient is φ = 71686144.

The previous prime is 71764283. The next prime is 71764333. The reversal of 71764321 is 12346717.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 71216721 = 740^2 + 8439^2 .

It is a cyclic number.

It is not a de Polignac number, because 71764321 - 2²³ = 63375713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71764921) 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, 37696 + ... + 39553.

It is an arithmetic number, because the mean of its divisors is an integer number (17960625).

Almost surely, 2^71764321 is an apocalyptic number.

It is an amenable number.

71764321 is a deficient number, since it is larger than the sum of its proper divisors (78179).

71764321 is an equidigital number, since it uses as much as digits as its factorization.

71764321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78178.

The product of its digits is 7056, while the sum is 31.

The square root of 71764321 is about 8471.3824727727. The cubic root of 71764321 is about 415.5623498460.

The spelling of 71764321 in words is "seventy-one million, seven hundred sixty-four thousand, three hundred twenty-one".