64391493 has 4 divisors (see below), whose sum is σ = 85855328. Its totient is φ = 42927660.

The previous prime is 64391471. The next prime is 64391519. The reversal of 64391493 is 39419346.

64391493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64391493 - 2⁶ = 64391429 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 (64341493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10731913 + ... + 10731918.

It is an arithmetic number, because the mean of its divisors is an integer number (21463832).

Almost surely, 2^64391493 is an apocalyptic number.

It is an amenable number.

64391493 is a deficient number, since it is larger than the sum of its proper divisors (21463835).

64391493 is a wasteful number, since it uses less digits than its factorization.

64391493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21463834.

The product of its digits is 69984, while the sum is 39.

The square root of 64391493 is about 8024.4310078659. The cubic root of 64391493 is about 400.8139529945.

The spelling of 64391493 in words is "sixty-four million, three hundred ninety-one thousand, four hundred ninety-three".