19917478428 has 24 divisors (see below), whose sum is σ = 46498540032. Its totient is φ = 6635670384.

The previous prime is 19917478411. The next prime is 19917478463. The reversal of 19917478428 is 82487471991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412300 + ... + 458067.

It is an arithmetic number, because the mean of its divisors is an integer number (1937439168).

Almost surely, 2^19917478428 is an apocalyptic number.

It is an amenable number.

19917478428 is an abundant number, since it is smaller than the sum of its proper divisors (26581061604).

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

19917478428 is a wasteful number, since it uses less digits than its factorization.

19917478428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872281 (or 872279 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 60.

The spelling of 19917478428 in words is "nineteen billion, nine hundred seventeen million, four hundred seventy-eight thousand, four hundred twenty-eight".