621844146 has 96 divisors (see below), whose sum is σ = 1752910848. Its totient is φ = 154487520.

The previous prime is 621844127. The next prime is 621844151. The reversal of 621844146 is 641448126.

It is a happy number.

621844146 is a `hidden beast` number, since 62 + 184 + 414 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 621844146.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22125 + ... + 41631.

It is an arithmetic number, because the mean of its divisors is an integer number (18259488).

Almost surely, 2^621844146 is an apocalyptic number.

621844146 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 621844146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (876455424).

621844146 is an abundant number, since it is smaller than the sum of its proper divisors (1131066702).

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

621844146 is a wasteful number, since it uses less digits than its factorization.

621844146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19556 (or 19553 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 621844146 is about 24936.8030428922. The cubic root of 621844146 is about 853.5464952437.

The spelling of 621844146 in words is "six hundred twenty-one million, eight hundred forty-four thousand, one hundred forty-six".