19222525728 has 144 divisors (see below), whose sum is σ = 62923573440. Its totient is φ = 5452558848.

The previous prime is 19222525703. The next prime is 19222525733. The reversal of 19222525728 is 82752522291.

19222525728 is a `hidden beast` number, since 1 + 9 + 2 + 22 + 52 + 572 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 245926 + ... + 314522.

It is an arithmetic number, because the mean of its divisors is an integer number (436969260).

Almost surely, 2^19222525728 is an apocalyptic number.

19222525728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19222525728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31461786720).

19222525728 is an abundant number, since it is smaller than the sum of its proper divisors (43701047712).

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

19222525728 is a wasteful number, since it uses less digits than its factorization.

19222525728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68759 (or 68748 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 19222525728 in words is "nineteen billion, two hundred twenty-two million, five hundred twenty-five thousand, seven hundred twenty-eight".