4578721 has 8 divisors (see below), whose sum is σ = 5319104. Its totient is φ = 3859920.

The previous prime is 4578709. The next prime is 4578727. The reversal of 4578721 is 1278754.

4578721 = 130² + 131² + ... + 251².

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4578721 - 2¹¹ = 4576673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4578727) 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, 4935 + ... + 5788.

It is an arithmetic number, because the mean of its divisors is an integer number (664888).

Almost surely, 2^4578721 is an apocalyptic number.

It is an amenable number.

4578721 is a deficient number, since it is larger than the sum of its proper divisors (740383).

4578721 is a wasteful number, since it uses less digits than its factorization.

4578721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10791.

The product of its digits is 15680, while the sum is 34.

The square root of 4578721 is about 2139.7946163125. The cubic root of 4578721 is about 166.0535101116.

The spelling of 4578721 in words is "four million, five hundred seventy-eight thousand, seven hundred twenty-one".