1855481628 has 144 divisors (see below), whose sum is σ = 5917048704. Its totient is φ = 444850560.

The previous prime is 1855481627. The next prime is 1855481633. The reversal of 1855481628 is 8261845581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855481627) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73051 + ... + 95117.

It is an arithmetic number, because the mean of its divisors is an integer number (41090616).

Almost surely, 2^1855481628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1855481628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2958524352).

1855481628 is an abundant number, since it is smaller than the sum of its proper divisors (4061567076).

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

1855481628 is a wasteful number, since it uses less digits than its factorization.

1855481628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22112 (or 22103 counting only the distinct ones).

The product of its digits is 614400, while the sum is 48.

The square root of 1855481628 is about 43075.3018329530. The cubic root of 1855481628 is about 1228.8123084849.

The spelling of 1855481628 in words is "one billion, eight hundred fifty-five million, four hundred eighty-one thousand, six hundred twenty-eight".