478509978 has 8 divisors (see below), whose sum is σ = 957019968. Its totient is φ = 159503324.

The previous prime is 478509973. The next prime is 478509979. The reversal of 478509978 is 879905874.

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

478509978 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (478509973) 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, 39875826 + ... + 39875837.

It is an arithmetic number, because the mean of its divisors is an integer number (119627496).

Almost surely, 2^478509978 is an apocalyptic number.

478509978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

478509978 is a wasteful number, since it uses less digits than its factorization.

478509978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79751668.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The square root of 478509978 is about 21874.8709253335. The cubic root of 478509978 is about 782.1625163985.

The spelling of 478509978 in words is "four hundred seventy-eight million, five hundred nine thousand, nine hundred seventy-eight".