19650528000 has 648 divisors, whose sum is σ = 74091876768. Its totient is φ = 4999680000.

The previous prime is 19650527999. The next prime is 19650528017. The reversal of 19650528000 is 82505691.

It is a happy number.

It is a super-2 number, since 2×19650528000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 276767965 + ... + 276768035.

It is an arithmetic number, because the mean of its divisors is an integer number (114339316).

Almost surely, 2^19650528000 is an apocalyptic number.

19650528000 is a gapful number since it is divisible by the number (10) 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 19650528000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37045938384).

19650528000 is an abundant number, since it is smaller than the sum of its proper divisors (54441348768).

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

19650528000 is an equidigital number, since it uses as much as digits as its factorization.

19650528000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 19650528000 in words is "nineteen billion, six hundred fifty million, five hundred twenty-eight thousand".