621056 has 20 divisors (see below), whose sum is σ = 1241922. Its totient is φ = 310272.

The previous prime is 621043. The next prime is 621059. The reversal of 621056 is 650126.

It can be written as a sum of positive squares in only one way, i.e., 614656 + 6400 = 784^2 + 80^2 .

It is a pancake number, because a pancake can be divided into 621056 parts by 1114 straight cuts.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621056.

It is not an unprimeable number, because it can be changed into a prime (621059) by changing a digit.

621056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95 + ... + 1118.

2⁶²¹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

621056 is a deficient number, since it is larger than the sum of its proper divisors (620866).

621056 is an equidigital number, since it uses as much as digits as its factorization.

621056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231 (or 1215 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 621056 is about 788.0710627856. The cubic root of 621056 is about 85.3185738362.

The spelling of 621056 in words is "six hundred twenty-one thousand, fifty-six".