1816087728 has 160 divisors (see below), whose sum is σ = 6025614336. Its totient is φ = 458118144.

The previous prime is 1816087727. The next prime is 1816087739. The reversal of 1816087728 is 8277806181.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1816087727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91426 + ... + 109502.

Almost surely, 2^1816087728 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 1816087728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3012807168).

1816087728 is an abundant number, since it is smaller than the sum of its proper divisors (4209526608).

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

1816087728 is a wasteful number, since it uses less digits than its factorization.

1816087728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18131 (or 18125 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 48.

The square root of 1816087728 is about 42615.5808126558. The cubic root of 1816087728 is about 1220.0536857142.

The spelling of 1816087728 in words is "one billion, eight hundred sixteen million, eighty-seven thousand, seven hundred twenty-eight".