621612424 has 8 divisors (see below), whose sum is σ = 1165523310. Its totient is φ = 310806208.

The previous prime is 621612413. The next prime is 621612427. The reversal of 621612424 is 424216126.

It can be written as a sum of positive squares in only one way, i.e., 429235524 + 192376900 = 20718^2 + 13870^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 621612392 and 621612401.

It is not an unprimeable number, because it can be changed into a prime (621612427) 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 as a sum of consecutive naturals, namely, 38850769 + ... + 38850784.

Almost surely, 2^621612424 is an apocalyptic number.

It is an amenable number.

621612424 is a deficient number, since it is larger than the sum of its proper divisors (543910886).

621612424 is a wasteful number, since it uses less digits than its factorization.

621612424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77701559 (or 77701555 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 621612424 is about 24932.1564249866. The cubic root of 621612424 is about 853.4404611328.

The spelling of 621612424 in words is "six hundred twenty-one million, six hundred twelve thousand, four hundred twenty-four".