478387691 has 8 divisors (see below), whose sum is σ = 498438144. Its totient is φ = 458625960.

The previous prime is 478387687. The next prime is 478387709. The reversal of 478387691 is 196783874.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 478387691 - 2² = 478387687 is a prime.

It is a super-2 number, since 2×478387691² = 457709565800622962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478387601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68795 + ... + 75428.

It is an arithmetic number, because the mean of its divisors is an integer number (62304768).

Almost surely, 2^478387691 is an apocalyptic number.

478387691 is a deficient number, since it is larger than the sum of its proper divisors (20050453).

478387691 is a wasteful number, since it uses less digits than its factorization.

478387691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144361.

The product of its digits is 2032128, while the sum is 53.

The square root of 478387691 is about 21872.0755988086. The cubic root of 478387691 is about 782.0958814545.

The spelling of 478387691 in words is "four hundred seventy-eight million, three hundred eighty-seven thousand, six hundred ninety-one".