21628034928 has 30 divisors (see below), whose sum is σ = 60528459264. Its totient is φ = 7209344928.

The previous prime is 21628034887. The next prime is 21628034963. The reversal of 21628034928 is 82943082612.

21628034928 is a `hidden beast` number, since 2 + 1 + 6 + 280 + 349 + 28 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75097200 + ... + 75097487.

Almost surely, 2^21628034928 is an apocalyptic number.

It is an amenable number.

21628034928 is an abundant number, since it is smaller than the sum of its proper divisors (38900424336).

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

21628034928 is a wasteful number, since it uses less digits than its factorization.

21628034928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150194701 (or 150194692 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21628034928 in words is "twenty-one billion, six hundred twenty-eight million, thirty-four thousand, nine hundred twenty-eight".