1870921728 has 228 divisors, whose sum is σ = 5916054508. Its totient is φ = 566231040.

The previous prime is 1870921681. The next prime is 1870921807. The reversal of 1870921728 is 8271290781.

It can be written as a sum of positive squares in 2 ways, for example, as 150994944 + 1719926784 = 12288^2 + 41472^2 .

It is a super-2 number, since 2×1870921728² = 7000696224605011968, 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 11 ways as a sum of consecutive naturals, for example, 30670818 + ... + 30670878.

Almost surely, 2^1870921728 is an apocalyptic number.

1870921728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1870921728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2958027254).

1870921728 is an abundant number, since it is smaller than the sum of its proper divisors (4045132780).

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

1870921728 is an frugal number, since it uses more digits than its factorization.

1870921728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 1870921728 is about 43254.1527254898. The cubic root of 1870921728 is about 1232.2113540806.

The spelling of 1870921728 in words is "one billion, eight hundred seventy million, nine hundred twenty-one thousand, seven hundred twenty-eight".