1605801860 has 96 divisors (see below), whose sum is σ = 3774339072. Its totient is φ = 569871360.

The previous prime is 1605801851. The next prime is 1605801863. The reversal of 1605801860 is 681085061.

It is a super-2 number, since 2×1605801860² = 5157199227158919200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1605801860.

It is not an unprimeable number, because it can be changed into a prime (1605801863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1345424 + ... + 1346616.

It is an arithmetic number, because the mean of its divisors is an integer number (39316032).

Almost surely, 2^1605801860 is an apocalyptic number.

1605801860 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 1605801860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1887169536).

1605801860 is an abundant number, since it is smaller than the sum of its proper divisors (2168537212).

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

1605801860 is a wasteful number, since it uses less digits than its factorization.

1605801860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1605801860 is about 40072.4576236597. The cubic root of 1605801860 is about 1171.0191183791.

The spelling of 1605801860 in words is "one billion, six hundred five million, eight hundred one thousand, eight hundred sixty".