478687081 has 4 divisors (see below), whose sum is σ = 478738512. Its totient is φ = 478635652.

The previous prime is 478687039. The next prime is 478687091. The reversal of 478687081 is 180786874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 478687081 - 2⁷ = 478686953 is a prime.

It is a super-2 number, since 2×478687081² = 458282643032601122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478687031) 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, 7411 + ... + 31816.

It is an arithmetic number, because the mean of its divisors is an integer number (119684628).

Almost surely, 2^478687081 is an apocalyptic number.

It is an amenable number.

478687081 is a deficient number, since it is larger than the sum of its proper divisors (51431).

478687081 is a wasteful number, since it uses less digits than its factorization.

478687081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51430.

The product of its (nonzero) digits is 602112, while the sum is 49.

The square root of 478687081 is about 21878.9186432968. The cubic root of 478687081 is about 782.2590007967.

The spelling of 478687081 in words is "four hundred seventy-eight million, six hundred eighty-seven thousand, eighty-one".