620944 has 15 divisors (see below), whose sum is σ = 1209217. Its totient is φ = 308896.

The previous prime is 620933. The next prime is 620947. The reversal of 620944 is 449026.

620944 = 28² + 29² + ... + 123².

The square root of 620944 is 788.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 12544 = 780^2 + 112^2 .

It is a super-2 number, since 2×620944² = 771142902272, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620947) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3054 + ... + 3250.

2⁶²⁰⁹⁴⁴ is an apocalyptic number.

620944 is the 788-th square number.

It is an amenable number.

620944 is a deficient number, since it is larger than the sum of its proper divisors (588273).

620944 is an equidigital number, since it uses as much as digits as its factorization.

620944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The cubic root of 620944 is about 85.3134448007.

Multiplying 620944 by its sum of digits (25), we get a square (15523600 = 3940²).

The spelling of 620944 in words is "six hundred twenty thousand, nine hundred forty-four".