628440008 has 64 divisors (see below), whose sum is σ = 1388136960. Its totient is φ = 261144576.

The previous prime is 628439993. The next prime is 628440013. The reversal of 628440008 is 800044826.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296360 + ... + 298472.

It is an arithmetic number, because the mean of its divisors is an integer number (21689640).

Almost surely, 2^628440008 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 628440008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694068480).

628440008 is an abundant number, since it is smaller than the sum of its proper divisors (759696952).

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

628440008 is a wasteful number, since it uses less digits than its factorization.

628440008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286 (or 2282 counting only the distinct ones).

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

The square root of 628440008 is about 25068.7057503972. The cubic root of 628440008 is about 856.5537257848.

The spelling of 628440008 in words is "six hundred twenty-eight million, four hundred forty thousand, eight".