478580721 has 16 divisors (see below), whose sum is σ = 673416000. Its totient is φ = 301485888.

The previous prime is 478580717. The next prime is 478580771. The reversal of 478580721 is 127085874.

It is not a de Polignac number, because 478580721 - 2² = 478580717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (478580771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12055 + ... + 33203.

It is an arithmetic number, because the mean of its divisors is an integer number (42088500).

Almost surely, 2^478580721 is an apocalyptic number.

It is an amenable number.

478580721 is a deficient number, since it is larger than the sum of its proper divisors (194835279).

478580721 is a wasteful number, since it uses less digits than its factorization.

478580721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21568.

The product of its (nonzero) digits is 125440, while the sum is 42.

The square root of 478580721 is about 21876.4878579721. The cubic root of 478580721 is about 782.2010595141.

The spelling of 478580721 in words is "four hundred seventy-eight million, five hundred eighty thousand, seven hundred twenty-one".