621488 has 40 divisors (see below), whose sum is σ = 1428480. Its totient is φ = 256320.

The previous prime is 621473. The next prime is 621521. The reversal of 621488 is 884126.

It is a self number, because there is not a number n which added to its sum of digits gives 621488.

It is an unprimeable number.

621488 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3383 + ... + 3561.

It is an arithmetic number, because the mean of its divisors is an integer number (35712).

2⁶²¹⁴⁸⁸ 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 621488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714240).

621488 is an abundant number, since it is smaller than the sum of its proper divisors (806992).

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

621488 is a wasteful number, since it uses less digits than its factorization.

621488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 219 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 621488 is about 788.3451020968. The cubic root of 621488 is about 85.3383514844.

The spelling of 621488 in words is "six hundred twenty-one thousand, four hundred eighty-eight".