621646793 has 4 divisors (see below), whose sum is σ = 622557648. Its totient is φ = 620735940.

The previous prime is 621646777. The next prime is 621646801. The reversal of 621646793 is 397646126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621646793 - 2⁴ = 621646777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621640793) 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, 454403 + ... + 455768.

It is an arithmetic number, because the mean of its divisors is an integer number (155639412).

Almost surely, 2^621646793 is an apocalyptic number.

It is an amenable number.

621646793 is a deficient number, since it is larger than the sum of its proper divisors (910855).

621646793 is an equidigital number, since it uses as much as digits as its factorization.

621646793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910854.

The product of its digits is 326592, while the sum is 44.

The square root of 621646793 is about 24932.8456659083. The cubic root of 621646793 is about 853.4561897731.

The spelling of 621646793 in words is "six hundred twenty-one million, six hundred forty-six thousand, seven hundred ninety-three".