1648446378 has 32 divisors (see below), whose sum is σ = 3492927360. Its totient is φ = 516848640.

The previous prime is 1648446377. The next prime is 1648446383. The reversal of 1648446378 is 8736448461.

It is a super-2 number, since 2×1648446378² = 5434750922282637768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1648446378.

It is not an unprimeable number, because it can be changed into a prime (1648446377) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 213363 + ... + 220953.

It is an arithmetic number, because the mean of its divisors is an integer number (109153980).

Almost surely, 2^1648446378 is an apocalyptic number.

1648446378 is an abundant number, since it is smaller than the sum of its proper divisors (1844480982).

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

1648446378 is a wasteful number, since it uses less digits than its factorization.

1648446378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9742.

The product of its digits is 3096576, while the sum is 51.

The square root of 1648446378 is about 40601.0637545373. The cubic root of 1648446378 is about 1181.2947528074.

The spelling of 1648446378 in words is "one billion, six hundred forty-eight million, four hundred forty-six thousand, three hundred seventy-eight".