1662647120 has 20 divisors (see below), whose sum is σ = 3865654740. Its totient is φ = 665058816.

The previous prime is 1662647099. The next prime is 1662647123. The reversal of 1662647120 is 217462661.

It can be written as a sum of positive squares in 2 ways, for example, as 688957504 + 973689616 = 26248^2 + 31204^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662647123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10391465 + ... + 10391624.

It is an arithmetic number, because the mean of its divisors is an integer number (193282737).

Almost surely, 2^1662647120 is an apocalyptic number.

1662647120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662647120 is an abundant number, since it is smaller than the sum of its proper divisors (2203007620).

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

1662647120 is a wasteful number, since it uses less digits than its factorization.

1662647120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20783102 (or 20783096 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1662647120 is about 40775.5701370318. The cubic root of 1662647120 is about 1184.6771943219.

The spelling of 1662647120 in words is "one billion, six hundred sixty-two million, six hundred forty-seven thousand, one hundred twenty".