478345581 has 20 divisors (see below), whose sum is σ = 816647392. Its totient is φ = 273340008.

The previous prime is 478345579. The next prime is 478345589. The reversal of 478345581 is 185543874.

478345581 is a `hidden beast` number, since 47 + 83 + 455 + 81 = 666.

It is not a de Polignac number, because 478345581 - 2¹ = 478345579 is a prime.

It is a super-2 number, since 2×478345581² = 457628989724455122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478345589) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 421255 + ... + 422388.

Almost surely, 2^478345581 is an apocalyptic number.

It is an amenable number.

478345581 is a deficient number, since it is larger than the sum of its proper divisors (338301811).

478345581 is an equidigital number, since it uses as much as digits as its factorization.

478345581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843662 (or 843653 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 478345581 is about 21871.1129346451. The cubic root of 478345581 is about 782.0729328262.

The spelling of 478345581 in words is "four hundred seventy-eight million, three hundred forty-five thousand, five hundred eighty-one".