720534 has 32 divisors (see below), whose sum is σ = 1542240. Its totient is φ = 224000.

The previous prime is 720527. The next prime is 720547. The reversal of 720534 is 435027.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 720534.

It is a congruent number.

It is an unprimeable number.

720534 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7084 + ... + 7184.

It is an arithmetic number, because the mean of its divisors is an integer number (48195).

2⁷²⁰⁵³⁴ is an apocalyptic number.

720534 is an abundant number, since it is smaller than the sum of its proper divisors (821706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720534 is a wasteful number, since it uses less digits than its factorization.

720534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 720534 is about 848.8427416194. The cubic root of 720534 is about 89.6502475122.

The spelling of 720534 in words is "seven hundred twenty thousand, five hundred thirty-four".