19907454528 has 168 divisors, whose sum is σ = 61564878648. Its totient is φ = 6113968128.

The previous prime is 19907454487. The next prime is 19907454551. The reversal of 19907454528 is 82545470991.

It is a happy number.

19907454528 is a `hidden beast` number, since 1 + 9 + 9 + 0 + 74 + 545 + 28 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4671995904 + 15235458624 = 68352^2 + 123432^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4587976 + ... + 4592312.

It is an arithmetic number, because the mean of its divisors is an integer number (366457611).

Almost surely, 2^19907454528 is an apocalyptic number.

19907454528 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 19907454528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30782439324).

19907454528 is an abundant number, since it is smaller than the sum of its proper divisors (41657424120).

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

19907454528 is a wasteful number, since it uses less digits than its factorization.

19907454528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4981 (or 4968 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 19907454528 in words is "nineteen billion, nine hundred seven million, four hundred fifty-four thousand, five hundred twenty-eight".