7646721 has 8 divisors (see below), whose sum is σ = 10732320. Its totient is φ = 4829472.

The previous prime is 7646711. The next prime is 7646729. The reversal of 7646721 is 1276467.

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

It is not a de Polignac number, because 7646721 - 2¹⁰ = 7645697 is a prime.

7646721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7646729) 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, 67020 + ... + 67133.

It is an arithmetic number, because the mean of its divisors is an integer number (1341540).

Almost surely, 2^7646721 is an apocalyptic number.

It is an amenable number.

7646721 is a deficient number, since it is larger than the sum of its proper divisors (3085599).

7646721 is a wasteful number, since it uses less digits than its factorization.

7646721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134175.

The product of its digits is 14112, while the sum is 33.

The square root of 7646721 is about 2765.2705111797. The cubic root of 7646721 is about 197.0115773900.

The spelling of 7646721 in words is "seven million, six hundred forty-six thousand, seven hundred twenty-one".