2091964644 has 315 divisors, whose sum is σ = 7023503235. Its totient is φ = 543367440.

The previous prime is 2091964639. The next prime is 2091964681. The reversal of 2091964644 is 4464691902.

The square root of 2091964644 is 45738.

It is a perfect power (a square), and thus also a powerful number.

It is a self number, because there is not a number n which added to its sum of digits gives 2091964644.

It is an unprimeable number.

It is a polite number, since it can be written in 104 ways as a sum of consecutive naturals, for example, 190178599 + ... + 190178609.

Almost surely, 2^2091964644 is an apocalyptic number.

2091964644 is the 45738-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091964644

2091964644 is an abundant number, since it is smaller than the sum of its proper divisors (4931538591).

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

2091964644 is an frugal number, since it uses more digits than its factorization.

2091964644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The cubic root of 2091964644 is about 1278.9437583610.

The spelling of 2091964644 in words is "two billion, ninety-one million, nine hundred sixty-four thousand, six hundred forty-four".