5628721 has 8 divisors (see below), whose sum is σ = 6712704. Its totient is φ = 4614720.

The previous prime is 5628719. The next prime is 5628739. The reversal of 5628721 is 1278265.

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

It is not a de Polignac number, because 5628721 - 2¹ = 5628719 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5628421) 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, 17320 + ... + 17641.

It is an arithmetic number, because the mean of its divisors is an integer number (839088).

Almost surely, 2^5628721 is an apocalyptic number.

It is an amenable number.

5628721 is a deficient number, since it is larger than the sum of its proper divisors (1083983).

5628721 is a wasteful number, since it uses less digits than its factorization.

5628721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34991.

The product of its digits is 6720, while the sum is 31.

The square root of 5628721 is about 2372.4925711159. The cubic root of 5628721 is about 177.8838719879.

The spelling of 5628721 in words is "five million, six hundred twenty-eight thousand, seven hundred twenty-one".