64450591 has 4 divisors (see below), whose sum is σ = 64529352. Its totient is φ = 64371832.

The previous prime is 64450571. The next prime is 64450601. The reversal of 64450591 is 19505446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19505446 = 2 ⋅9752723.

It is a cyclic number.

It is not a de Polignac number, because 64450591 - 2¹⁵ = 64417823 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 (64450511) 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, 38140 + ... + 39793.

It is an arithmetic number, because the mean of its divisors is an integer number (16132338).

Almost surely, 2^64450591 is an apocalyptic number.

64450591 is a deficient number, since it is larger than the sum of its proper divisors (78761).

64450591 is an equidigital number, since it uses as much as digits as its factorization.

64450591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78760.

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

The square root of 64450591 is about 8028.1125428086. The cubic root of 64450591 is about 400.9365367858.

The spelling of 64450591 in words is "sixty-four million, four hundred fifty thousand, five hundred ninety-one".