478471877 has 4 divisors (see below), whose sum is σ = 515277420. Its totient is φ = 441666336.

The previous prime is 478471853. The next prime is 478471933. The reversal of 478471877 is 778174874.

It is a Cunningham number, because it is equal to 21874²+1.

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 70795396 + 407676481 = 8414^2 + 20191^2 .

It is a cyclic number.

It is not a de Polignac number, because 478471877 - 2¹⁴ = 478455493 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 (478471837) 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, 18402752 + ... + 18402777.

It is an arithmetic number, because the mean of its divisors is an integer number (128819355).

Almost surely, 2^478471877 is an apocalyptic number.

It is an amenable number.

478471877 is a deficient number, since it is larger than the sum of its proper divisors (36805543).

478471877 is a wasteful number, since it uses less digits than its factorization.

478471877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36805542.

The product of its digits is 2458624, while the sum is 53.

The square root of 478471877 is about 21874.0000228582. Note that the first 4 decimals coincide. The cubic root of 478471877 is about 782.1417561452.

The spelling of 478471877 in words is "four hundred seventy-eight million, four hundred seventy-one thousand, eight hundred seventy-seven".