1985477728 has 48 divisors (see below), whose sum is σ = 4248311760. Its totient is φ = 907946496.

The previous prime is 1985477693. The next prime is 1985477759. The reversal of 1985477728 is 8277745891.

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, 23451 + ... + 67237.

It is an arithmetic number, because the mean of its divisors is an integer number (88506495).

Almost surely, 2^1985477728 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 1985477728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2124155880).

1985477728 is an abundant number, since it is smaller than the sum of its proper divisors (2262834032).

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

1985477728 is a wasteful number, since it uses less digits than its factorization.

1985477728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43919 (or 43911 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 58.

The square root of 1985477728 is about 44558.6998014978. The cubic root of 1985477728 is about 1256.8641530339.

The spelling of 1985477728 in words is "one billion, nine hundred eighty-five million, four hundred seventy-seven thousand, seven hundred twenty-eight".