628022840 has 64 divisors (see below), whose sum is σ = 1547812800. Its totient is φ = 228272128.

The previous prime is 628022821. The next prime is 628022849. The reversal of 628022840 is 48220826.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 628022797 and 628022806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628022849) 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 15 ways as a sum of consecutive naturals, for example, 3797 + ... + 35643.

It is an arithmetic number, because the mean of its divisors is an integer number (24184575).

Almost surely, 2^628022840 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 628022840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773906400).

628022840 is an abundant number, since it is smaller than the sum of its proper divisors (919789960).

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

628022840 is a wasteful number, since it uses less digits than its factorization.

628022840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31904 (or 31900 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 628022840 is about 25060.3838757510. The cubic root of 628022840 is about 856.3641527173.

The spelling of 628022840 in words is "six hundred twenty-eight million, twenty-two thousand, eight hundred forty".