19976915828 has 24 divisors (see below), whose sum is σ = 35919611112. Its totient is φ = 9714397824.

The previous prime is 19976915821. The next prime is 19976915851. The reversal of 19976915828 is 82851967991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4407366544 + 15569549284 = 66388^2 + 124778^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19976915821) 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 7 ways as a sum of consecutive naturals, for example, 339350 + ... + 393842.

It is an arithmetic number, because the mean of its divisors is an integer number (1496650463).

Almost surely, 2^19976915828 is an apocalyptic number.

It is an amenable number.

19976915828 is a deficient number, since it is larger than the sum of its proper divisors (15942695284).

19976915828 is a wasteful number, since it uses less digits than its factorization.

19976915828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57011 (or 57009 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 65.

The spelling of 19976915828 in words is "nineteen billion, nine hundred seventy-six million, nine hundred fifteen thousand, eight hundred twenty-eight".