3855521280 has 480 divisors, whose sum is σ = 14066037216. Its totient is φ = 895352832.

The previous prime is 3855521237. The next prime is 3855521281. The reversal of 3855521280 is 821255583.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855521281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52815324 + ... + 52815396.

Almost surely, 2^3855521280 is an apocalyptic number.

3855521280 is a gapful number since it is divisible by the number (30) 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 3855521280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7033018608).

3855521280 is an abundant number, since it is smaller than the sum of its proper divisors (10210515936).

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

3855521280 is a wasteful number, since it uses less digits than its factorization.

3855521280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 39.

The square root of 3855521280 is about 62092.8440321427. The cubic root of 3855521280 is about 1568.0540728264.

The spelling of 3855521280 in words is "three billion, eight hundred fifty-five million, five hundred twenty-one thousand, two hundred eighty".