478640289 has 4 divisors (see below), whose sum is σ = 638187056. Its totient is φ = 319093524.

The previous prime is 478640257. The next prime is 478640293. The reversal of 478640289 is 982046874.

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 478640289 - 2⁵ = 478640257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478640249) 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, 79773379 + ... + 79773384.

It is an arithmetic number, because the mean of its divisors is an integer number (159546764).

Almost surely, 2^478640289 is an apocalyptic number.

It is an amenable number.

478640289 is a deficient number, since it is larger than the sum of its proper divisors (159546767).

478640289 is a wasteful number, since it uses less digits than its factorization.

478640289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159546766.

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 478640289 is about 21877.8492772941. The cubic root of 478640289 is about 782.2335111764.

The spelling of 478640289 in words is "four hundred seventy-eight million, six hundred forty thousand, two hundred eighty-nine".