1667613220 has 96 divisors (see below), whose sum is σ = 4319175168. Its totient is φ = 526666752.

The previous prime is 1667613217. The next prime is 1667613221. The reversal of 1667613220 is 223167661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1667613221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1613824 + ... + 1614856.

It is an arithmetic number, because the mean of its divisors is an integer number (44991408).

Almost surely, 2^1667613220 is an apocalyptic number.

1667613220 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 1667613220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2159587584).

1667613220 is an abundant number, since it is smaller than the sum of its proper divisors (2651561948).

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

1667613220 is a wasteful number, since it uses less digits than its factorization.

1667613220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949 (or 1947 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 1667613220 is about 40836.4202642690. The cubic root of 1667613220 is about 1185.8555116331.

The spelling of 1667613220 in words is "one billion, six hundred sixty-seven million, six hundred thirteen thousand, two hundred twenty".