621986450 has 18 divisors (see below), whose sum is σ = 1157222901. Its totient is φ = 248724040.

The previous prime is 621986423. The next prime is 621986459. The reversal of 621986450 is 54689126.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 609546721 + 12439729 = 24689^2 + 3527^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17635.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621986398 and 621986407.

It is not an unprimeable number, because it can be changed into a prime (621986459) 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 8 ways as a sum of consecutive naturals, for example, 174587 + ... + 178113.

Almost surely, 2^621986450 is an apocalyptic number.

621986450 is a deficient number, since it is larger than the sum of its proper divisors (535236451).

621986450 is an frugal number, since it uses more digits than its factorization.

621986450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066 (or 3534 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 621986450 is about 24939.6561724495. The cubic root of 621986450 is about 853.6115993469.

The spelling of 621986450 in words is "six hundred twenty-one million, nine hundred eighty-six thousand, four hundred fifty".