621447400 has 96 divisors (see below), whose sum is σ = 1685160000. Its totient is φ = 213044160.

The previous prime is 621447377. The next prime is 621447401. The reversal of 621447400 is 4744126.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621447401) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 64071 + ... + 73129.

It is an arithmetic number, because the mean of its divisors is an integer number (17553750).

Almost surely, 2^621447400 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 621447400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842580000).

621447400 is an abundant number, since it is smaller than the sum of its proper divisors (1063712600).

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

621447400 is a wasteful number, since it uses less digits than its factorization.

621447400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096 (or 9073 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 621447400 is about 24928.8467442840. The cubic root of 621447400 is about 853.3649314200.

The spelling of 621447400 in words is "six hundred twenty-one million, four hundred forty-seven thousand, four hundred".