621630273 has 8 divisors (see below), whose sum is σ = 904189536. Its totient is φ = 376745600.

The previous prime is 621630209. The next prime is 621630301. The reversal of 621630273 is 372036126.

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

It is not a de Polignac number, because 621630273 - 2⁶ = 621630209 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621630273.

It is not an unprimeable number, because it can be changed into a prime (621630203) 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, 9418608 + ... + 9418673.

It is an arithmetic number, because the mean of its divisors is an integer number (113023692).

Almost surely, 2^621630273 is an apocalyptic number.

It is an amenable number.

621630273 is a deficient number, since it is larger than the sum of its proper divisors (282559263).

621630273 is a wasteful number, since it uses less digits than its factorization.

621630273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18837295.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 621630273 is about 24932.5143738051. The cubic root of 621630273 is about 853.4486296273.

Adding to 621630273 its reverse (372036126), we get a palindrome (993666399).

The spelling of 621630273 in words is "six hundred twenty-one million, six hundred thirty thousand, two hundred seventy-three".