478884781 has 4 divisors (see below), whose sum is σ = 507054492. Its totient is φ = 450715072.

The previous prime is 478884761. The next prime is 478884787. The reversal of 478884781 is 187488874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187488874 = 2 ⋅93744437.

It can be written as a sum of positive squares in 2 ways, for example, as 166797225 + 312087556 = 12915^2 + 17666^2 .

It is a cyclic number.

It is not a de Polignac number, because 478884781 - 2²⁷ = 344667053 is a prime.

It is a super-2 number, since 2×478884781² = 458661266946835922, 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 (478884787) 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, 14084830 + ... + 14084863.

It is an arithmetic number, because the mean of its divisors is an integer number (126763623).

Almost surely, 2^478884781 is an apocalyptic number.

It is an amenable number.

478884781 is a deficient number, since it is larger than the sum of its proper divisors (28169711).

478884781 is a wasteful number, since it uses less digits than its factorization.

478884781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28169710.

The product of its digits is 3211264, while the sum is 55.

The square root of 478884781 is about 21883.4362246883. The cubic root of 478884781 is about 782.3666781812.

The spelling of 478884781 in words is "four hundred seventy-eight million, eight hundred eighty-four thousand, seven hundred eighty-one".