478242721 has 8 divisors (see below), whose sum is σ = 521877600. Its totient is φ = 434634240.

The previous prime is 478242659. The next prime is 478242733. The reversal of 478242721 is 127242874.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478242721 is a prime.

It is a super-2 number, since 2×478242721² = 457432200378967682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478248721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68490 + ... + 75148.

It is an arithmetic number, because the mean of its divisors is an integer number (65234700).

Almost surely, 2^478242721 is an apocalyptic number.

It is an amenable number.

478242721 is a deficient number, since it is larger than the sum of its proper divisors (43634879).

478242721 is a wasteful number, since it uses less digits than its factorization.

478242721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13199.

The product of its digits is 50176, while the sum is 37.

The square root of 478242721 is about 21868.7613046556. The cubic root of 478242721 is about 782.0168716912.

The spelling of 478242721 in words is "four hundred seventy-eight million, two hundred forty-two thousand, seven hundred twenty-one".