478051821 has 32 divisors (see below), whose sum is σ = 767312000. Its totient is φ = 294149232.

The previous prime is 478051817. The next prime is 478051897. The reversal of 478051821 is 128150874.

478051821 is a `hidden beast` number, since 47 + 80 + 518 + 21 = 666.

It is not a de Polignac number, because 478051821 - 2² = 478051817 is a prime.

It is a super-2 number, since 2×478051821² = 457067087122832082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478051421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55290 + ... + 63348.

It is an arithmetic number, because the mean of its divisors is an integer number (23978500).

Almost surely, 2^478051821 is an apocalyptic number.

It is an amenable number.

478051821 is a deficient number, since it is larger than the sum of its proper divisors (289260179).

478051821 is an equidigital number, since it uses as much as digits as its factorization.

478051821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8107 (or 8075 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 478051821 is about 21864.3961956419. The cubic root of 478051821 is about 781.9128053651.

The spelling of 478051821 in words is "four hundred seventy-eight million, fifty-one thousand, eight hundred twenty-one".