621376 has 56 divisors (see below), whose sum is σ = 1503680. Its totient is φ = 248832.

The previous prime is 621371. The next prime is 621389. The reversal of 621376 is 673126.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×621376² = 772216266752, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 621376.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621371) by changing a digit.

621376 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8476 + ... + 8548.

2⁶²¹³⁷⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751840).

621376 is an abundant number, since it is smaller than the sum of its proper divisors (882304).

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

621376 is a wasteful number, since it uses less digits than its factorization.

621376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 101 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 621376 is about 788.2740640158. The cubic root of 621376 is about 85.3332248263. Note that the first 3 decimals are identical.

The spelling of 621376 in words is "six hundred twenty-one thousand, three hundred seventy-six".