478777821 has 8 divisors (see below), whose sum is σ = 666125760. Its totient is φ = 305307552.

The previous prime is 478777807. The next prime is 478777829. The reversal of 478777821 is 128777874.

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

It is not a de Polignac number, because 478777821 - 2⁷ = 478777693 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478777829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3469336 + ... + 3469473.

It is an arithmetic number, because the mean of its divisors is an integer number (83265720).

Almost surely, 2^478777821 is an apocalyptic number.

It is an amenable number.

478777821 is a deficient number, since it is larger than the sum of its proper divisors (187347939).

478777821 is a wasteful number, since it uses less digits than its factorization.

478777821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6938835.

The product of its digits is 1229312, while the sum is 51.

The square root of 478777821 is about 21880.9922307011. The cubic root of 478777821 is about 782.3084260545.

The spelling of 478777821 in words is "four hundred seventy-eight million, seven hundred seventy-seven thousand, eight hundred twenty-one".