64398493 has 4 divisors (see below), whose sum is σ = 65454268. Its totient is φ = 63342720.

The previous prime is 64398487. The next prime is 64398511. The reversal of 64398493 is 39489346.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13089924 + 51308569 = 3618^2 + 7163^2 .

It is a cyclic number.

It is not a de Polignac number, because 64398493 - 2⁹ = 64397981 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 (64398403) 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, 527796 + ... + 527917.

It is an arithmetic number, because the mean of its divisors is an integer number (16363567).

Almost surely, 2^64398493 is an apocalyptic number.

It is an amenable number.

64398493 is a deficient number, since it is larger than the sum of its proper divisors (1055775).

64398493 is a wasteful number, since it uses less digits than its factorization.

64398493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055774.

The product of its digits is 559872, while the sum is 46.

The square root of 64398493 is about 8024.8671640096. The cubic root of 64398493 is about 400.8284766315.

The spelling of 64398493 in words is "sixty-four million, three hundred ninety-eight thousand, four hundred ninety-three".