7067721 has 8 divisors (see below), whose sum is σ = 9727744. Its totient is φ = 4559760.

The previous prime is 7067713. The next prime is 7067729. The reversal of 7067721 is 1277607.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7067713) and next prime (7067729).

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

It is not a de Polignac number, because 7067721 - 2³ = 7067713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7067729) 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, 37906 + ... + 38091.

It is an arithmetic number, because the mean of its divisors is an integer number (1215968).

Almost surely, 2^7067721 is an apocalyptic number.

It is an amenable number.

7067721 is a deficient number, since it is larger than the sum of its proper divisors (2660023).

7067721 is a wasteful number, since it uses less digits than its factorization.

7067721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76031.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 7067721 is about 2658.5185724384. The cubic root of 7067721 is about 191.9080234375.

The spelling of 7067721 in words is "seven million, sixty-seven thousand, seven hundred twenty-one".