478546861 has 4 divisors (see below), whose sum is σ = 515358172. Its totient is φ = 441735552.

The previous prime is 478546853. The next prime is 478546867. The reversal of 478546861 is 168645874.

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 303804900 + 174741961 = 17430^2 + 13219^2 .

It is a cyclic number.

It is not a de Polignac number, because 478546861 - 2³ = 478546853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478546867) 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, 18405636 + ... + 18405661.

It is an arithmetic number, because the mean of its divisors is an integer number (128839543).

Almost surely, 2^478546861 is an apocalyptic number.

It is an amenable number.

478546861 is a deficient number, since it is larger than the sum of its proper divisors (36811311).

478546861 is a wasteful number, since it uses less digits than its factorization.

478546861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36811310.

The product of its digits is 1290240, while the sum is 49.

The square root of 478546861 is about 21875.7139540633. The cubic root of 478546861 is about 782.1826119452.

The spelling of 478546861 in words is "four hundred seventy-eight million, five hundred forty-six thousand, eight hundred sixty-one".