64723291 has 4 divisors (see below), whose sum is σ = 68129800. Its totient is φ = 61316784.

The previous prime is 64723271. The next prime is 64723313. The reversal of 64723291 is 19232746.

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 64723291 - 2¹⁷ = 64592219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64723261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703226 + ... + 1703263.

It is an arithmetic number, because the mean of its divisors is an integer number (17032450).

Almost surely, 2^64723291 is an apocalyptic number.

64723291 is a deficient number, since it is larger than the sum of its proper divisors (3406509).

64723291 is a wasteful number, since it uses less digits than its factorization.

64723291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3406508.

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

The square root of 64723291 is about 8045.0786820267. The cubic root of 64723291 is about 401.5012150848.

The spelling of 64723291 in words is "sixty-four million, seven hundred twenty-three thousand, two hundred ninety-one".