64354993 has 4 divisors (see below), whose sum is σ = 64520820. Its totient is φ = 64189168.

The previous prime is 64354987. The next prime is 64354999. The reversal of 64354993 is 39945346.

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

It is an interprime number because it is at equal distance from previous prime (64354987) and next prime (64354999).

It can be written as a sum of positive squares in 2 ways, for example, as 32353344 + 32001649 = 5688^2 + 5657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64354993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64354999) 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, 82330 + ... + 83107.

It is an arithmetic number, because the mean of its divisors is an integer number (16130205).

Almost surely, 2^64354993 is an apocalyptic number.

It is an amenable number.

64354993 is a deficient number, since it is larger than the sum of its proper divisors (165827).

64354993 is a wasteful number, since it uses less digits than its factorization.

64354993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165826.

The product of its digits is 349920, while the sum is 43.

The square root of 64354993 is about 8022.1563809240. The cubic root of 64354993 is about 400.7382055433.

The spelling of 64354993 in words is "sixty-four million, three hundred fifty-four thousand, nine hundred ninety-three".