1662612220 has 24 divisors (see below), whose sum is σ = 3502725408. Its totient is φ = 662904000.

The previous prime is 1662612187. The next prime is 1662612277. The reversal of 1662612220 is 222162661.

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 7 ways as a sum of consecutive naturals, for example, 127431 + ... + 139870.

It is an arithmetic number, because the mean of its divisors is an integer number (145946892).

Almost surely, 2^1662612220 is an apocalyptic number.

1662612220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662612220 is an abundant number, since it is smaller than the sum of its proper divisors (1840113188).

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

1662612220 is a wasteful number, since it uses less digits than its factorization.

1662612220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267621 (or 267619 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1662612220 is about 40775.1421824621. The cubic root of 1662612220 is about 1184.6689052262.

Adding to 1662612220 its reverse (222162661), we get a palindrome (1884774881).

The spelling of 1662612220 in words is "one billion, six hundred sixty-two million, six hundred twelve thousand, two hundred twenty".