1881387628 has 18 divisors (see below), whose sum is σ = 3363986276. Its totient is φ = 920674728.

The previous prime is 1881387611. The next prime is 1881387631. The reversal of 1881387628 is 8267831881.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 97626 + ... + 115297.

Almost surely, 2^1881387628 is an apocalyptic number.

It is an amenable number.

1881387628 is a deficient number, since it is larger than the sum of its proper divisors (1482598648).

1881387628 is a wasteful number, since it uses less digits than its factorization.

1881387628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213021 (or 212972 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The square root of 1881387628 is about 43374.9654524358. The cubic root of 1881387628 is about 1234.5047385018.

The spelling of 1881387628 in words is "one billion, eight hundred eighty-one million, three hundred eighty-seven thousand, six hundred twenty-eight".