2191720896 has 56 divisors (see below), whose sum is σ = 6443258640. Its totient is φ = 730573056.

The previous prime is 2191720877. The next prime is 2191720943. The reversal of 2191720896 is 6980271912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632451 + ... + 635906.

It is an arithmetic number, because the mean of its divisors is an integer number (115058190).

Almost surely, 2^2191720896 is an apocalyptic number.

It is an amenable number.

2191720896 is an abundant number, since it is smaller than the sum of its proper divisors (4251537744).

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

2191720896 is a wasteful number, since it uses less digits than its factorization.

2191720896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268378 (or 1268362 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 2191720896 is about 46815.8188649948. The cubic root of 2191720896 is about 1298.9579215018.

The spelling of 2191720896 in words is "two billion, one hundred ninety-one million, seven hundred twenty thousand, eight hundred ninety-six".