478640447 has 8 divisors (see below), whose sum is σ = 496903440. Its totient is φ = 460494720.

The previous prime is 478640443. The next prime is 478640453. The reversal of 478640447 is 744046874.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 478640447 - 2² = 478640443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 478640398 and 478640407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478640441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20954 + ... + 37367.

It is an arithmetic number, because the mean of its divisors is an integer number (62112930).

Almost surely, 2^478640447 is an apocalyptic number.

478640447 is a deficient number, since it is larger than the sum of its proper divisors (18262993).

478640447 is a wasteful number, since it uses less digits than its factorization.

478640447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58633.

The product of its (nonzero) digits is 602112, while the sum is 44.

The square root of 478640447 is about 21877.8528882521. The cubic root of 478640447 is about 782.2335972486.

The spelling of 478640447 in words is "four hundred seventy-eight million, six hundred forty thousand, four hundred forty-seven".