1609197660 has 144 divisors (see below), whose sum is σ = 5684043456. Its totient is φ = 360861696.

The previous prime is 1609197637. The next prime is 1609197677. The reversal of 1609197660 is 667919061.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54732 + ... + 78828.

It is an arithmetic number, because the mean of its divisors is an integer number (39472524).

Almost surely, 2^1609197660 is an apocalyptic number.

1609197660 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 1609197660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2842021728).

1609197660 is an abundant number, since it is smaller than the sum of its proper divisors (4074845796).

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

1609197660 is a wasteful number, since it uses less digits than its factorization.

1609197660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24172 (or 24167 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1609197660 is about 40114.8059947945. The cubic root of 1609197660 is about 1171.8439912008.

The spelling of 1609197660 in words is "one billion, six hundred nine million, one hundred ninety-seven thousand, six hundred sixty".