19640613828 has 96 divisors (see below), whose sum is σ = 51660177408. Its totient is φ = 5753779200.

The previous prime is 19640613827. The next prime is 19640613841. The reversal of 19640613828 is 82831604691.

It is not an unprimeable number, because it can be changed into a prime (19640613821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5428276 + ... + 5431892.

It is an arithmetic number, because the mean of its divisors is an integer number (538126848).

Almost surely, 2^19640613828 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 19640613828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25830088704).

19640613828 is an abundant number, since it is smaller than the sum of its proper divisors (32019563580).

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

19640613828 is a wasteful number, since it uses less digits than its factorization.

19640613828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993 (or 4991 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 19640613828 in words is "nineteen billion, six hundred forty million, six hundred thirteen thousand, eight hundred twenty-eight".