621646373 has 4 divisors (see below), whose sum is σ = 621734988. Its totient is φ = 621557760.

The previous prime is 621646309. The next prime is 621646391. The reversal of 621646373 is 373646126.

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

It can be written as a sum of positive squares in 2 ways, for example, as 343657444 + 277988929 = 18538^2 + 16673^2 .

It is a cyclic number.

It is not a de Polignac number, because 621646373 - 2⁶ = 621646309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621646073) 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, 32786 + ... + 48147.

It is an arithmetic number, because the mean of its divisors is an integer number (155433747).

Almost surely, 2^621646373 is an apocalyptic number.

It is an amenable number.

621646373 is a deficient number, since it is larger than the sum of its proper divisors (88615).

621646373 is an equidigital number, since it uses as much as digits as its factorization.

621646373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88614.

The product of its digits is 108864, while the sum is 38.

The square root of 621646373 is about 24932.8372432822. The cubic root of 621646373 is about 853.4559975677.

The spelling of 621646373 in words is "six hundred twenty-one million, six hundred forty-six thousand, three hundred seventy-three".