621525630 has 128 divisors (see below), whose sum is σ = 1690191360. Its totient is φ = 144944640.

The previous prime is 621525599. The next prime is 621525631. The reversal of 621525630 is 36525126.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621525631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1330657 + ... + 1331123.

It is an arithmetic number, because the mean of its divisors is an integer number (13204620).

Almost surely, 2^621525630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621525630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845095680).

621525630 is an abundant number, since it is smaller than the sum of its proper divisors (1068665730).

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

621525630 is a wasteful number, since it uses less digits than its factorization.

621525630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 621525630 is about 24930.4157606727. The cubic root of 621525630 is about 853.4007381177.

The spelling of 621525630 in words is "six hundred twenty-one million, five hundred twenty-five thousand, six hundred thirty".