2151779328 has 132 divisors (see below), whose sum is σ = 6258907200. Its totient is φ = 711991296.

The previous prime is 2151779299. The next prime is 2151779359. The reversal of 2151779328 is 8239771512.

2151779328 is a `hidden beast` number, since 21 + 517 + 7 + 93 + 28 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1372401 + ... + 1373967.

Almost surely, 2^2151779328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151779328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3129453600).

2151779328 is an abundant number, since it is smaller than the sum of its proper divisors (4107127872).

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

2151779328 is a wasteful number, since it uses less digits than its factorization.

2151779328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742 (or 1721 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 2151779328 is about 46387.2754966273. The cubic root of 2151779328 is about 1291.0188309634.

The spelling of 2151779328 in words is "two billion, one hundred fifty-one million, seven hundred seventy-nine thousand, three hundred twenty-eight".