478302721 has 4 divisors (see below), whose sum is σ = 515095252. Its totient is φ = 441510192.

The previous prime is 478302707. The next prime is 478302763. The reversal of 478302721 is 127203874.

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

It can be written as a sum of positive squares in 2 ways, for example, as 238393600 + 239909121 = 15440^2 + 15489^2 .

It is a cyclic number.

It is not a de Polignac number, because 478302721 - 2⁷ = 478302593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478302421) 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, 18396246 + ... + 18396271.

It is an arithmetic number, because the mean of its divisors is an integer number (128773813).

Almost surely, 2^478302721 is an apocalyptic number.

It is an amenable number.

478302721 is a deficient number, since it is larger than the sum of its proper divisors (36792531).

478302721 is a wasteful number, since it uses less digits than its factorization.

478302721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36792530.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 478302721 is about 21870.1330814424. The cubic root of 478302721 is about 782.0495740883.

The spelling of 478302721 in words is "four hundred seventy-eight million, three hundred two thousand, seven hundred twenty-one".