621420630 has 32 divisors (see below), whose sum is σ = 1505896704. Its totient is φ = 164102496.

The previous prime is 621420617. The next prime is 621420643. The reversal of 621420630 is 36024126.

It is an interprime number because it is at equal distance from previous prime (621420617) and next prime (621420643).

It is a self number, because there is not a number n which added to its sum of digits gives 621420630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97464 + ... + 103643.

It is an arithmetic number, because the mean of its divisors is an integer number (47059272).

Almost surely, 2^621420630 is an apocalyptic number.

621420630 is an abundant number, since it is smaller than the sum of its proper divisors (884476074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621420630 is a wasteful number, since it uses less digits than its factorization.

621420630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201220.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 621420630 is about 24928.3098103341. The cubic root of 621420630 is about 853.3526778180.

Adding to 621420630 its reverse (36024126), we get a palindrome (657444756).

The spelling of 621420630 in words is "six hundred twenty-one million, four hundred twenty thousand, six hundred thirty".