19789407478 has 16 divisors (see below), whose sum is σ = 31325163120. Its totient is φ = 9350310816.

The previous prime is 19789407419. The next prime is 19789407499. The reversal of 19789407478 is 87470498791.

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, 640801 + ... + 670972.

It is an arithmetic number, because the mean of its divisors is an integer number (1957822695).

Almost surely, 2^19789407478 is an apocalyptic number.

19789407478 is a deficient number, since it is larger than the sum of its proper divisors (11535755642).

19789407478 is a wasteful number, since it uses less digits than its factorization.

19789407478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312191.

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 19789407478 in words is "nineteen billion, seven hundred eighty-nine million, four hundred seven thousand, four hundred seventy-eight".