621491268 has 12 divisors (see below), whose sum is σ = 1450146320. Its totient is φ = 207163752.

The previous prime is 621491261. The next prime is 621491281. The reversal of 621491268 is 862194126.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (621491261) 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 3 ways as a sum of consecutive naturals, for example, 25895458 + ... + 25895481.

Almost surely, 2^621491268 is an apocalyptic number.

It is an amenable number.

621491268 is an abundant number, since it is smaller than the sum of its proper divisors (828655052).

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

621491268 is a wasteful number, since it uses less digits than its factorization.

621491268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51790946 (or 51790944 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 621491268 is about 24929.7265929653. The cubic root of 621491268 is about 853.3850106372.

The spelling of 621491268 in words is "six hundred twenty-one million, four hundred ninety-one thousand, two hundred sixty-eight".