478474928987 has 4 divisors (see below), whose sum is σ = 521972649816. Its totient is φ = 434977208160.

The previous prime is 478474928977. The next prime is 478474929001. The reversal of 478474928987 is 789829474874.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 478474928987 - 2²⁰ = 478473880411 is a prime.

It is a super-2 number, since 2×478474928987² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478474928927) 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, 21748860398 + ... + 21748860419.

It is an arithmetic number, because the mean of its divisors is an integer number (130493162454).

Almost surely, 2^478474928987 is an apocalyptic number.

478474928987 is a deficient number, since it is larger than the sum of its proper divisors (43497720829).

478474928987 is a wasteful number, since it uses less digits than its factorization.

478474928987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43497720828.

The product of its digits is 1820786688, while the sum is 77.

The spelling of 478474928987 in words is "four hundred seventy-eight billion, four hundred seventy-four million, nine hundred twenty-eight thousand, nine hundred eighty-seven".