720658 has 8 divisors (see below), whose sum is σ = 1084860. Its totient is φ = 359040.

The previous prime is 720653. The next prime is 720661. The reversal of 720658 is 856027.

It can be written as a sum of positive squares in 2 ways, for example, as 717409 + 3249 = 847^2 + 57^2 .

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

It is not an unprimeable number, because it can be changed into a prime (720653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378 + ... + 1258.

2⁷²⁰⁶⁵⁸ is an apocalyptic number.

720658 is a deficient number, since it is larger than the sum of its proper divisors (364202).

720658 is a wasteful number, since it uses less digits than its factorization.

720658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 720658 is about 848.9157790971. The cubic root of 720658 is about 89.6553899913.

It can be divided in two parts, 720 and 658, that added together give a triangular number (1378 = T₅₂).

The spelling of 720658 in words is "seven hundred twenty thousand, six hundred fifty-eight".