621000000 has 392 divisors, whose sum is σ = 2381219520. Its totient is φ = 158400000.

The previous prime is 620999983. The next prime is 621000001. The reversal of 621000000 is 126.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 26999989 + ... + 27000011.

Almost surely, 2^621000000 is an apocalyptic number.

621000000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190609760).

621000000 is an abundant number, since it is smaller than the sum of its proper divisors (1760219520).

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

621000000 is an frugal number, since it uses more digits than its factorization.

621000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 621000000 is about 24919.8715887542. The cubic root of 621000000 is about 853.1600939555.

Adding to 621000000 its reverse (126), we get a palindrome (621000126).

The spelling of 621000000 in words is "six hundred twenty-one million", and thus it is an aban number.