621442667 has 4 divisors (see below), whose sum is σ = 657998136. Its totient is φ = 584887200.

The previous prime is 621442651. The next prime is 621442687. The reversal of 621442667 is 766244126.

621442667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621442667 - 2⁴ = 621442651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621442667.

It is not an unprimeable number, because it can be changed into a prime (621442687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18277709 + ... + 18277742.

It is an arithmetic number, because the mean of its divisors is an integer number (164499534).

Almost surely, 2^621442667 is an apocalyptic number.

621442667 is a deficient number, since it is larger than the sum of its proper divisors (36555469).

621442667 is a wasteful number, since it uses less digits than its factorization.

621442667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36555468.

The product of its digits is 96768, while the sum is 38.

The square root of 621442667 is about 24928.7518139196. The cubic root of 621442667 is about 853.3627649795.

The spelling of 621442667 in words is "six hundred twenty-one million, four hundred forty-two thousand, six hundred sixty-seven".