621445000 has 80 divisors (see below), whose sum is σ = 1588554000. Its totient is φ = 225960000.

The previous prime is 621444997. The next prime is 621445009. The reversal of 621445000 is 544126.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (621445009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49351 + ... + 60649.

It is an arithmetic number, because the mean of its divisors is an integer number (19856925).

Almost surely, 2^621445000 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 621445000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (794277000).

621445000 is an abundant number, since it is smaller than the sum of its proper divisors (967109000).

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

621445000 is a wasteful number, since it uses less digits than its factorization.

621445000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11336 (or 11317 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 621445000 is about 24928.7986072334. The cubic root of 621445000 is about 853.3638328671.

Adding to 621445000 its reverse (544126), we get a palindrome (621989126).

The spelling of 621445000 in words is "six hundred twenty-one million, four hundred forty-five thousand".