1881620628 has 48 divisors (see below), whose sum is σ = 4487071680. Its totient is φ = 613476864.

The previous prime is 1881620599. The next prime is 1881620683. The reversal of 1881620628 is 8260261881.

It is a super-2 number, since 2×1881620628² = 7080992375430228768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1881620628.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209943 + ... + 218721.

It is an arithmetic number, because the mean of its divisors is an integer number (93480660).

Almost surely, 2^1881620628 is an apocalyptic number.

It is an amenable number.

1881620628 is an abundant number, since it is smaller than the sum of its proper divisors (2605451052).

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

1881620628 is a wasteful number, since it uses less digits than its factorization.

1881620628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9176 (or 9174 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 1881620628 is about 43377.6512503847. The cubic root of 1881620628 is about 1234.5556987127. Note that the first 3 decimals are identical.

The spelling of 1881620628 in words is "one billion, eight hundred eighty-one million, six hundred twenty thousand, six hundred twenty-eight".