628681386 has 32 divisors (see below), whose sum is σ = 1401399360. Its totient is φ = 186852096.

The previous prime is 628681381. The next prime is 628681421. The reversal of 628681386 is 683186826.

It is not an unprimeable number, because it can be changed into a prime (628681381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160261 + ... + 164136.

It is an arithmetic number, because the mean of its divisors is an integer number (43793730).

Almost surely, 2^628681386 is an apocalyptic number.

628681386 is an abundant number, since it is smaller than the sum of its proper divisors (772717974).

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

628681386 is a wasteful number, since it uses less digits than its factorization.

628681386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324438.

The product of its digits is 663552, while the sum is 48.

The square root of 628681386 is about 25073.5196173174. The cubic root of 628681386 is about 856.6633765378.

The spelling of 628681386 in words is "six hundred twenty-eight million, six hundred eighty-one thousand, three hundred eighty-six".