1628683988 has 24 divisors (see below), whose sum is σ = 2863099008. Its totient is φ = 810665856.

The previous prime is 1628683943. The next prime is 1628684003. The reversal of 1628683988 is 8893868261.

It is a super-2 number, since 2×1628683988² = 5305223065535168288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097495 + ... + 1098977.

It is an arithmetic number, because the mean of its divisors is an integer number (119295792).

Almost surely, 2^1628683988 is an apocalyptic number.

It is an amenable number.

1628683988 is a deficient number, since it is larger than the sum of its proper divisors (1234415020).

1628683988 is a wasteful number, since it uses less digits than its factorization.

1628683988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543 (or 2541 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 59.

The square root of 1628683988 is about 40356.9571201794. The cubic root of 1628683988 is about 1176.5551131939. Note that the first 3 decimals are identical.

The spelling of 1628683988 in words is "one billion, six hundred twenty-eight million, six hundred eighty-three thousand, nine hundred eighty-eight".