64273291 has 4 divisors (see below), whose sum is σ = 65047752. Its totient is φ = 63498832.

The previous prime is 64273289. The next prime is 64273331. The reversal of 64273291 is 19237246.

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

It is a cyclic number.

It is not a de Polignac number, because 64273291 - 2¹ = 64273289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64273591) 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, 387106 + ... + 387271.

It is an arithmetic number, because the mean of its divisors is an integer number (16261938).

Almost surely, 2^64273291 is an apocalyptic number.

64273291 is a deficient number, since it is larger than the sum of its proper divisors (774461).

64273291 is an equidigital number, since it uses as much as digits as its factorization.

64273291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774460.

The product of its digits is 18144, while the sum is 34.

The square root of 64273291 is about 8017.0624919605. The cubic root of 64273291 is about 400.5685477508.

The spelling of 64273291 in words is "sixty-four million, two hundred seventy-three thousand, two hundred ninety-one".