621640063 has 8 divisors (see below), whose sum is σ = 678706560. Its totient is φ = 564665880.

The previous prime is 621640057. The next prime is 621640079. The reversal of 621640063 is 360046126.

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

It is a cyclic number.

It is not a de Polignac number, because 621640063 - 2⁵ = 621640031 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 (621640093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8595 + ... + 36292.

It is an arithmetic number, because the mean of its divisors is an integer number (84838320).

Almost surely, 2^621640063 is an apocalyptic number.

621640063 is a deficient number, since it is larger than the sum of its proper divisors (57066497).

621640063 is a wasteful number, since it uses less digits than its factorization.

621640063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46157.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 621640063 is about 24932.7107030102. The cubic root of 621640063 is about 853.4531098994.

Adding to 621640063 its reverse (360046126), we get a palindrome (981686189).

The spelling of 621640063 in words is "six hundred twenty-one million, six hundred forty thousand, sixty-three".