2102061780 has 576 divisors, whose sum is σ = 8390054400. Its totient is φ = 438939648.

The previous prime is 2102061757. The next prime is 2102061799. The reversal of 2102061780 is 871602012.

2102061780 is a `hidden beast` number, since 21 + 0 + 20 + 617 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 21670692 + ... + 21670788.

Almost surely, 2^2102061780 is an apocalyptic number.

2102061780 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 2102061780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4195027200).

2102061780 is an abundant number, since it is smaller than the sum of its proper divisors (6287992620).

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

2102061780 is a wasteful number, since it uses less digits than its factorization.

2102061780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 2102061780 is about 45848.2472947440. The cubic root of 2102061780 is about 1280.9981187825.

Adding to 2102061780 its reverse (871602012), we get a palindrome (2973663792).

The spelling of 2102061780 in words is "two billion, one hundred two million, sixty-one thousand, seven hundred eighty".