721067 has 8 divisors (see below), whose sum is σ = 757680. Its totient is φ = 685440.

The previous prime is 721057. The next prime is 721079. The reversal of 721067 is 760127.

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 721067 - 2⁴ = 721051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721037) 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, 1559 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (94710).

2⁷²¹⁰⁶⁷ is an apocalyptic number.

721067 is a deficient number, since it is larger than the sum of its proper divisors (36613).

721067 is a wasteful number, since it uses less digits than its factorization.

721067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 721067 is about 849.1566404380. The cubic root of 721067 is about 89.6723476974.

Subtracting 721067 from its reverse (760127), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 721067 in words is "seven hundred twenty-one thousand, sixty-seven".