621707643 has 20 divisors (see below), whose sum is σ = 940489440. Its totient is φ = 409221072.

The previous prime is 621707623. The next prime is 621707699. The reversal of 621707643 is 346707126.

621707643 is a `hidden beast` number, since 6 + 2 + 1 + 7 + 0 + 7 + 643 = 666.

It is not a de Polignac number, because 621707643 - 2⁶ = 621707579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 621707598 and 621707607.

It is not an unprimeable number, because it can be changed into a prime (621707623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42180 + ... + 54977.

It is an arithmetic number, because the mean of its divisors is an integer number (47024472).

Almost surely, 2^621707643 is an apocalyptic number.

621707643 is a deficient number, since it is larger than the sum of its proper divisors (318781797).

621707643 is an equidigital number, since it uses as much as digits as its factorization.

621707643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97248 (or 97239 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 621707643 is about 24934.0659139259. The cubic root of 621707643 is about 853.4840357650.

The spelling of 621707643 in words is "six hundred twenty-one million, seven hundred seven thousand, six hundred forty-three".