3601985820 has 48 divisors (see below), whose sum is σ = 10106183808. Its totient is φ = 958565440.

The previous prime is 3601985809. The next prime is 3601985867. The reversal of 3601985820 is 285891063.

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 15 ways as a sum of consecutive naturals, for example, 31674 + ... + 90593.

It is an arithmetic number, because the mean of its divisors is an integer number (210545496).

Almost surely, 2^3601985820 is an apocalyptic number.

3601985820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3601985820 is an abundant number, since it is smaller than the sum of its proper divisors (6504197988).

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

3601985820 is a wasteful number, since it uses less digits than its factorization.

3601985820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122770 (or 122768 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 3601985820 is about 60016.5462185221. The cubic root of 3601985820 is about 1532.9006190232.

The spelling of 3601985820 in words is "three billion, six hundred one million, nine hundred eighty-five thousand, eight hundred twenty".