621204645 has 8 divisors (see below), whose sum is σ = 993927456. Its totient is φ = 331309136.

The previous prime is 621204613. The next prime is 621204697. The reversal of 621204645 is 546402126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621204645 - 2⁵ = 621204613 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 20706807 + ... + 20706836.

It is an arithmetic number, because the mean of its divisors is an integer number (124240932).

Almost surely, 2^621204645 is an apocalyptic number.

It is an amenable number.

621204645 is a deficient number, since it is larger than the sum of its proper divisors (372722811).

621204645 is a wasteful number, since it uses less digits than its factorization.

621204645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41413651.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 621204645 is about 24923.9773110152. The cubic root of 621204645 is about 853.2538007575.

The spelling of 621204645 in words is "six hundred twenty-one million, two hundred four thousand, six hundred forty-five".