478444521 has 16 divisors (see below), whose sum is σ = 664956224. Its totient is φ = 305705664.

The previous prime is 478444517. The next prime is 478444541. The reversal of 478444521 is 125444874.

It is not a de Polignac number, because 478444521 - 2² = 478444517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 478444521.

It is not an unprimeable number, because it can be changed into a prime (478444541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24730 + ... + 39603.

It is an arithmetic number, because the mean of its divisors is an integer number (41559764).

Almost surely, 2^478444521 is an apocalyptic number.

It is an amenable number.

478444521 is a deficient number, since it is larger than the sum of its proper divisors (186511703).

478444521 is a wasteful number, since it uses less digits than its factorization.

478444521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64440.

The product of its digits is 143360, while the sum is 39.

The square root of 478444521 is about 21873.3747053353. The cubic root of 478444521 is about 782.1268498858.

The spelling of 478444521 in words is "four hundred seventy-eight million, four hundred forty-four thousand, five hundred twenty-one".