19215979828 has 12 divisors (see below), whose sum is σ = 33634877220. Its totient is φ = 9606014912.

The previous prime is 19215979819. The next prime is 19215979831. The reversal of 19215979828 is 82897951291.

19215979828 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in 2 ways, for example, as 14606656164 + 4609323664 = 120858^2 + 67892^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471751 + ... + 510862.

It is an arithmetic number, because the mean of its divisors is an integer number (2802906435).

Almost surely, 2^19215979828 is an apocalyptic number.

It is an amenable number.

19215979828 is a deficient number, since it is larger than the sum of its proper divisors (14418897392).

19215979828 is a wasteful number, since it uses less digits than its factorization.

19215979828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987506 (or 987504 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 61.

The spelling of 19215979828 in words is "nineteen billion, two hundred fifteen million, nine hundred seventy-nine thousand, eight hundred twenty-eight".