691620 has 24 divisors (see below), whose sum is σ = 1936704. Its totient is φ = 184416.

The previous prime is 691591. The next prime is 691631. The reversal of 691620 is 26196.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5704 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (80696).

2⁶⁹¹⁶²⁰ is an apocalyptic number.

691620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691620 is an abundant number, since it is smaller than the sum of its proper divisors (1245084).

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

691620 is a wasteful number, since it uses less digits than its factorization.

691620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11539 (or 11537 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 691620 is about 831.6369400165. The cubic root of 691620 is about 88.4346608277.

The spelling of 691620 in words is "six hundred ninety-one thousand, six hundred twenty".