63478993 has 4 divisors (see below), whose sum is σ = 64040868. Its totient is φ = 62917120.

The previous prime is 63478967. The next prime is 63479023. The reversal of 63478993 is 39987436.

63478993 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.

It can be written as a sum of positive squares in 2 ways, for example, as 25877569 + 37601424 = 5087^2 + 6132^2 .

It is a cyclic number.

It is not a de Polignac number, because 63478993 - 2¹³ = 63470801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63478903) 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, 280768 + ... + 280993.

It is an arithmetic number, because the mean of its divisors is an integer number (16010217).

Almost surely, 2^63478993 is an apocalyptic number.

It is an amenable number.

63478993 is a deficient number, since it is larger than the sum of its proper divisors (561875).

63478993 is a wasteful number, since it uses less digits than its factorization.

63478993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561874.

The product of its digits is 979776, while the sum is 49.

The square root of 63478993 is about 7967.3705198139. The cubic root of 63478993 is about 398.9116099538.

The spelling of 63478993 in words is "sixty-three million, four hundred seventy-eight thousand, nine hundred ninety-three".