1815992064 has 108 divisors (see below), whose sum is σ = 5416702200. Its totient is φ = 584435712.

The previous prime is 1815992047. The next prime is 1815992077. The reversal of 1815992064 is 4602995181.

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, 53227 + ... + 80405.

It is an arithmetic number, because the mean of its divisors is an integer number (50154650).

Almost surely, 2^1815992064 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 1815992064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2708351100).

1815992064 is an abundant number, since it is smaller than the sum of its proper divisors (3600710136).

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

1815992064 is a wasteful number, since it uses less digits than its factorization.

1815992064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27230 (or 27213 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1815992064 is about 42614.4583914896. The cubic root of 1815992064 is about 1220.0322628752.

The spelling of 1815992064 in words is "one billion, eight hundred fifteen million, nine hundred ninety-two thousand, sixty-four".