1818549648 has 90 divisors (see below), whose sum is σ = 5320535766. Its totient is φ = 579803136.

The previous prime is 1818549617. The next prime is 1818549659. The reversal of 1818549648 is 8469458181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1228642704 + 589906944 = 35052^2 + 24288^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1818549594 and 1818549603.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 64240 + ... + 88112.

Almost surely, 2^1818549648 is an apocalyptic number.

1818549648 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 1818549648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2660267883).

1818549648 is an abundant number, since it is smaller than the sum of its proper divisors (3501986118).

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

1818549648 is a wasteful number, since it uses less digits than its factorization.

1818549648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23933 (or 23901 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The square root of 1818549648 is about 42644.4562399382. The cubic root of 1818549648 is about 1220.6047454212.

The spelling of 1818549648 in words is "one billion, eight hundred eighteen million, five hundred forty-nine thousand, six hundred forty-eight".