621612 has 36 divisors (see below), whose sum is σ = 1624896. Its totient is φ = 200160.

The previous prime is 621611. The next prime is 621617. The reversal of 621612 is 216126.

It is a happy number.

621612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621612.

It is not an unprimeable number, because it can be changed into a prime (621611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 838 + ... + 1394.

It is an arithmetic number, because the mean of its divisors is an integer number (45136).

2⁶²¹⁶¹² is an apocalyptic number.

621612 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812448).

621612 is an abundant number, since it is smaller than the sum of its proper divisors (1003284).

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

621612 is a wasteful number, since it uses less digits than its factorization.

621612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 593 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 621612 is about 788.4237439347. The cubic root of 621612 is about 85.3440267090.

Adding to 621612 its reverse (216126), we get a palindrome (837738).

The spelling of 621612 in words is "six hundred twenty-one thousand, six hundred twelve".