628681420 has 24 divisors (see below), whose sum is σ = 1397892384. Its totient is φ = 236679936.

The previous prime is 628681381. The next prime is 628681421. The reversal of 628681420 is 24186826.

It is a self number, because there is not a number n which added to its sum of digits gives 628681420.

It is not an unprimeable number, because it can be changed into a prime (628681421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924192 + ... + 924871.

It is an arithmetic number, because the mean of its divisors is an integer number (58245516).

Almost surely, 2^628681420 is an apocalyptic number.

It is an amenable number.

628681420 is an abundant number, since it is smaller than the sum of its proper divisors (769210964).

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

628681420 is a wasteful number, since it uses less digits than its factorization.

628681420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849089 (or 1849087 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 628681420 is about 25073.5202953235. The cubic root of 628681420 is about 856.6633919810.

The spelling of 628681420 in words is "six hundred twenty-eight million, six hundred eighty-one thousand, four hundred twenty".