1620222136 has 32 divisors (see below), whose sum is σ = 3303387360. Its totient is φ = 740529792.

The previous prime is 1620222113. The next prime is 1620222173. The reversal of 1620222136 is 6312220261.

It is a self number, because there is not a number n which added to its sum of digits gives 1620222136.

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 7 ways as a sum of consecutive naturals, for example, 64915 + ... + 86338.

It is an arithmetic number, because the mean of its divisors is an integer number (103230855).

Almost surely, 2^1620222136 is an apocalyptic number.

It is an amenable number.

1620222136 is an abundant number, since it is smaller than the sum of its proper divisors (1683165224).

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

1620222136 is a wasteful number, since it uses less digits than its factorization.

1620222136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151375 (or 151371 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1620222136 is about 40251.9830070520. The cubic root of 1620222136 is about 1174.5139709490.

Adding to 1620222136 its reverse (6312220261), we get a palindrome (7932442397).

The spelling of 1620222136 in words is "one billion, six hundred twenty million, two hundred twenty-two thousand, one hundred thirty-six".