1620222012 has 36 divisors (see below), whose sum is σ = 4100588856. Its totient is φ = 539411040.

The previous prime is 1620221989. The next prime is 1620222041. The reversal of 1620222012 is 2102220261.

1620222012 is a `hidden beast` number, since 1 + 620 + 22 + 20 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 2562 + ... + 56982.

It is an arithmetic number, because the mean of its divisors is an integer number (113905246).

Almost surely, 2^1620222012 is an apocalyptic number.

1620222012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1620222012 is an abundant number, since it is smaller than the sum of its proper divisors (2480366844).

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

1620222012 is a wasteful number, since it uses less digits than its factorization.

1620222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55258 (or 55253 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1620222012 is about 40251.9814667551. The cubic root of 1620222012 is about 1174.5139409861.

Adding to 1620222012 its reverse (2102220261), we get a palindrome (3722442273).

The spelling of 1620222012 in words is "one billion, six hundred twenty million, two hundred twenty-two thousand, twelve".