2158769988 has 48 divisors (see below), whose sum is σ = 5599661760. Its totient is φ = 719223552.

The previous prime is 2158769959. The next prime is 2158770023. The reversal of 2158769988 is 8899678512.

It is a happy number.

It is a super-2 number, since 2×2158769988² = 9320575722179040288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283195 + ... + 290717.

It is an arithmetic number, because the mean of its divisors is an integer number (116659620).

Almost surely, 2^2158769988 is an apocalyptic number.

It is an amenable number.

2158769988 is an abundant number, since it is smaller than the sum of its proper divisors (3440891772).

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

2158769988 is a wasteful number, since it uses less digits than its factorization.

2158769988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10193 (or 10185 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The square root of 2158769988 is about 46462.5654478958. The cubic root of 2158769988 is about 1292.4153988625.

The spelling of 2158769988 in words is "two billion, one hundred fifty-eight million, seven hundred sixty-nine thousand, nine hundred eighty-eight".