621128456 has 64 divisors (see below), whose sum is σ = 1340161200. Its totient is φ = 267337728.

The previous prime is 621128447. The next prime is 621128461. The reversal of 621128456 is 654821126.

It can be written as a sum of positive squares in 8 ways, for example, as 34035556 + 587092900 = 5834^2 + 24230^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 198230 + ... + 201338.

Almost surely, 2^621128456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621128456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670080600).

621128456 is an abundant number, since it is smaller than the sum of its proper divisors (719032744).

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

621128456 is a wasteful number, since it uses less digits than its factorization.

621128456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258 (or 3254 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 621128456 is about 24922.4488363403. The cubic root of 621128456 is about 853.2189162729.

The spelling of 621128456 in words is "six hundred twenty-one million, one hundred twenty-eight thousand, four hundred fifty-six".