2091919680 has 168 divisors, whose sum is σ = 7427756544. Its totient is φ = 539827200.

The previous prime is 2091919679. The next prime is 2091919691. The reversal of 2091919680 is 869191902.

It is a super-2 number, since 2×2091919680² = 8752255895142604800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77565 + ... + 100995.

Almost surely, 2^2091919680 is an apocalyptic number.

2091919680 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 2091919680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3713878272).

2091919680 is an abundant number, since it is smaller than the sum of its proper divisors (5335836864).

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

2091919680 is a wasteful number, since it uses less digits than its factorization.

2091919680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23485 (or 23472 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 2091919680 is about 45737.5084585945. The cubic root of 2091919680 is about 1278.9345952299.

The spelling of 2091919680 in words is "two billion, ninety-one million, nine hundred nineteen thousand, six hundred eighty".