1688620628 has 12 divisors (see below), whose sum is σ = 2955443232. Its totient is φ = 844208280.

The previous prime is 1688620627. The next prime is 1688620639. The reversal of 1688620628 is 8260268861.

It is a super-2 number, since 2×1688620628² = 5702879250614228768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688620627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21251 + ... + 61877.

It is an arithmetic number, because the mean of its divisors is an integer number (246286936).

Almost surely, 2^1688620628 is an apocalyptic number.

It is an amenable number.

1688620628 is a deficient number, since it is larger than the sum of its proper divisors (1266822604).

1688620628 is a wasteful number, since it uses less digits than its factorization.

1688620628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51022 (or 51020 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 1688620628 is about 41092.8293988136. The cubic root of 1688620628 is about 1190.8142693376.

The spelling of 1688620628 in words is "one billion, six hundred eighty-eight million, six hundred twenty thousand, six hundred twenty-eight".