2169729680 has 40 divisors (see below), whose sum is σ = 5207357184. Its totient is φ = 839894400.

The previous prime is 2169729673. The next prime is 2169729689. The reversal of 2169729680 is 869279612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2169729689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434966 + ... + 439925.

Almost surely, 2^2169729680 is an apocalyptic number.

2169729680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2169729680 is an abundant number, since it is smaller than the sum of its proper divisors (3037627504).

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

2169729680 is a wasteful number, since it uses less digits than its factorization.

2169729680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874935 (or 874929 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 2169729680 is about 46580.3572334949. The cubic root of 2169729680 is about 1294.5988292404.

The spelling of 2169729680 in words is "two billion, one hundred sixty-nine million, seven hundred twenty-nine thousand, six hundred eighty".