621605404 has 24 divisors (see below), whose sum is σ = 1250089568. Its totient is φ = 264928320.

The previous prime is 621605399. The next prime is 621605407. The reversal of 621605404 is 404506126.

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 (621605407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56259 + ... + 66394.

Almost surely, 2^621605404 is an apocalyptic number.

It is an amenable number.

621605404 is an abundant number, since it is smaller than the sum of its proper divisors (628484164).

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

621605404 is a wasteful number, since it uses less digits than its factorization.

621605404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122845 (or 122843 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 621605404 is about 24932.0156425428. The cubic root of 621605404 is about 853.4372484264.

The spelling of 621605404 in words is "six hundred twenty-one million, six hundred five thousand, four hundred four".