64045591 has 4 divisors (see below), whose sum is σ = 64063384. Its totient is φ = 64027800.

The previous prime is 64045589. The next prime is 64045603. The reversal of 64045591 is 19554046.

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 64045591 - 2¹ = 64045589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64045391) 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, 1380 + ... + 11401.

It is an arithmetic number, because the mean of its divisors is an integer number (16015846).

Almost surely, 2^64045591 is an apocalyptic number.

64045591 is a deficient number, since it is larger than the sum of its proper divisors (17793).

64045591 is a wasteful number, since it uses less digits than its factorization.

64045591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17792.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 64045591 is about 8002.8489302248. The cubic root of 64045591 is about 400.0949587053.

The spelling of 64045591 in words is "sixty-four million, forty-five thousand, five hundred ninety-one".