620811641 has 8 divisors (see below), whose sum is σ = 638144640. Its totient is φ = 603507888.

The previous prime is 620811619. The next prime is 620811647. The reversal of 620811641 is 146118026.

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

It is not a de Polignac number, because 620811641 - 2⁶ = 620811577 is a prime.

It is a super-2 number, since 2×620811641² = 770814187202225762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620811647) by changing a digit.

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, 39920 + ... + 53246.

It is an arithmetic number, because the mean of its divisors is an integer number (79768080).

Almost surely, 2^620811641 is an apocalyptic number.

It is an amenable number.

620811641 is a deficient number, since it is larger than the sum of its proper divisors (17332999).

620811641 is a wasteful number, since it uses less digits than its factorization.

620811641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14623.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 620811641 is about 24916.0920089809. The cubic root of 620811641 is about 853.0738263052.

Adding to 620811641 its reverse (146118026), we get a palindrome (766929667).

The spelling of 620811641 in words is "six hundred twenty million, eight hundred eleven thousand, six hundred forty-one".