478521978 has 32 divisors (see below), whose sum is σ = 1061752320. Its totient is φ = 142547760.

The previous prime is 478521977. The next prime is 478521991. The reversal of 478521978 is 879125874.

It is a self number, because there is not a number n which added to its sum of digits gives 478521978.

It is not an unprimeable number, because it can be changed into a prime (478521977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57550 + ... + 65337.

It is an arithmetic number, because the mean of its divisors is an integer number (33179760).

Almost surely, 2^478521978 is an apocalyptic number.

478521978 is an abundant number, since it is smaller than the sum of its proper divisors (583230342).

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

478521978 is a wasteful number, since it uses less digits than its factorization.

478521978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122962.

The product of its digits is 1128960, while the sum is 51.

The square root of 478521978 is about 21875.1452109466. The cubic root of 478521978 is about 782.1690546611.

The spelling of 478521978 in words is "four hundred seventy-eight million, five hundred twenty-one thousand, nine hundred seventy-eight".