1662323220 has 72 divisors (see below), whose sum is σ = 5048010240. Its totient is φ = 442791360.

The previous prime is 1662323219. The next prime is 1662323237. The reversal of 1662323220 is 223232661.

1662323220 is a `hidden beast` number, since 1 + 6 + 623 + 2 + 32 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173721 + ... + 183039.

Almost surely, 2^1662323220 is an apocalyptic number.

1662323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662323220 is an abundant number, since it is smaller than the sum of its proper divisors (3385687020).

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

1662323220 is a wasteful number, since it uses less digits than its factorization.

1662323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10325 (or 10320 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 1662323220 is about 40771.5982026704. The cubic root of 1662323220 is about 1184.6002604056.

Adding to 1662323220 its reverse (223232661), we get a palindrome (1885555881).

The spelling of 1662323220 in words is "one billion, six hundred sixty-two million, three hundred twenty-three thousand, two hundred twenty".