1817428320 has 384 divisors, whose sum is σ = 6746664960. Its totient is φ = 456192000.

The previous prime is 1817428303. The next prime is 1817428343. The reversal of 1817428320 is 238247181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5490555 + ... + 5490885.

It is an arithmetic number, because the mean of its divisors is an integer number (17569440).

Almost surely, 2^1817428320 is an apocalyptic number.

1817428320 is a gapful number since it is divisible by the number (10) 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 1817428320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3373332480).

1817428320 is an abundant number, since it is smaller than the sum of its proper divisors (4929236640).

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

1817428320 is a wasteful number, since it uses less digits than its factorization.

1817428320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1817428320 is about 42631.3068061489. The cubic root of 1817428320 is about 1220.3538165758.

The spelling of 1817428320 in words is "one billion, eight hundred seventeen million, four hundred twenty-eight thousand, three hundred twenty".