628786380 has 96 divisors (see below), whose sum is σ = 1860768000. Its totient is φ = 158208768.

The previous prime is 628786369. The next prime is 628786409. The reversal of 628786380 is 83687826.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 321646 + ... + 323594.

It is an arithmetic number, because the mean of its divisors is an integer number (19383000).

Almost surely, 2^628786380 is an apocalyptic number.

628786380 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 628786380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930384000).

628786380 is an abundant number, since it is smaller than the sum of its proper divisors (1231981620).

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

628786380 is a wasteful number, since it uses less digits than its factorization.

628786380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2261 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 628786380 is about 25075.6132527203. The cubic root of 628786380 is about 856.7110633894.

The spelling of 628786380 in words is "six hundred twenty-eight million, seven hundred eighty-six thousand, three hundred eighty".