5678721 has 8 divisors (see below), whose sum is σ = 8412960. Its totient is φ = 3785796.

The previous prime is 5678713. The next prime is 5678737. The reversal of 5678721 is 1278765.

It is not a de Polignac number, because 5678721 - 2³ = 5678713 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5678521) 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, 105135 + ... + 105188.

It is an arithmetic number, because the mean of its divisors is an integer number (1051620).

Almost surely, 2^5678721 is an apocalyptic number.

It is an amenable number.

5678721 is a deficient number, since it is larger than the sum of its proper divisors (2734239).

5678721 is a wasteful number, since it uses less digits than its factorization.

5678721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210332 (or 210326 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 5678721 is about 2383.0067142163. The cubic root of 5678721 is about 178.4090349309.

The spelling of 5678721 in words is "five million, six hundred seventy-eight thousand, seven hundred twenty-one".