1662320440 has 128 divisors (see below), whose sum is σ = 4303134720. Its totient is φ = 572313600.

The previous prime is 1662320417. The next prime is 1662320467. The reversal of 1662320440 is 440232661.

It is a junction number, because it is equal to n+sod(n) for n = 1662320399 and 1662320408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 639784 + ... + 642376.

It is an arithmetic number, because the mean of its divisors is an integer number (33618240).

Almost surely, 2^1662320440 is an apocalyptic number.

1662320440 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 1662320440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2151567360).

1662320440 is an abundant number, since it is smaller than the sum of its proper divisors (2640814280).

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

1662320440 is a wasteful number, since it uses less digits than its factorization.

1662320440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693 (or 2689 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 1662320440 is about 40771.5641102963. The cubic root of 1662320440 is about 1184.5996000466.

The spelling of 1662320440 in words is "one billion, six hundred sixty-two million, three hundred twenty thousand, four hundred forty".