2016781520 has 80 divisors (see below), whose sum is σ = 5113839360. Its totient is φ = 735201792.

The previous prime is 2016781517. The next prime is 2016781523. The reversal of 2016781520 is 251876102.

It is an interprime number because it is at equal distance from previous prime (2016781517) and next prime (2016781523).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2016781523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69887 + ... + 94433.

It is an arithmetic number, because the mean of its divisors is an integer number (63922992).

Almost surely, 2^2016781520 is an apocalyptic number.

2016781520 is a gapful number since it is divisible by the number (20) 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 2016781520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2556919680).

2016781520 is an abundant number, since it is smaller than the sum of its proper divisors (3097057840).

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

2016781520 is a wasteful number, since it uses less digits than its factorization.

2016781520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24652 (or 24646 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 2016781520 is about 44908.5907149178. The cubic root of 2016781520 is about 1263.4351379048.

The spelling of 2016781520 in words is "two billion, sixteen million, seven hundred eighty-one thousand, five hundred twenty".