621744 has 20 divisors (see below), whose sum is σ = 1606296. Its totient is φ = 207232.

The previous prime is 621739. The next prime is 621749. The reversal of 621744 is 447126.

621744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (621739) and next prime (621749).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (621749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6429 + ... + 6524.

2⁶²¹⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

621744 is an abundant number, since it is smaller than the sum of its proper divisors (984552).

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

621744 is a wasteful number, since it uses less digits than its factorization.

621744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12964 (or 12958 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 621744 is about 788.5074508209. The cubic root of 621744 is about 85.3500672478.

The spelling of 621744 in words is "six hundred twenty-one thousand, seven hundred forty-four".