961720 has 16 divisors (see below), whose sum is σ = 2163960. Its totient is φ = 384672.

The previous prime is 961703. The next prime is 961729. The reversal of 961720 is 27169.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961729) by changing a digit.

961720 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11982 + ... + 12061.

2⁹⁶¹⁷²⁰ is an apocalyptic number.

It is an amenable number.

961720 is an abundant number, since it is smaller than the sum of its proper divisors (1202240).

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

961720 is a wasteful number, since it uses less digits than its factorization.

961720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24054 (or 24050 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 961720 is about 980.6732381380. The cubic root of 961720 is about 98.7073628890.

Adding to 961720 its reverse (27169), we get a palindrome (988889).

It can be divided in two parts, 961 and 720, that added together give a square (1681 = 41²).

The spelling of 961720 in words is "nine hundred sixty-one thousand, seven hundred twenty".