19749678236 has 12 divisors (see below), whose sum is σ = 34572028512. Its totient is φ = 9871955808.

The previous prime is 19749678211. The next prime is 19749678301. The reversal of 19749678236 is 63287694791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705380 + ... + 732843.

It is an arithmetic number, because the mean of its divisors is an integer number (2881002376).

Almost surely, 2^19749678236 is an apocalyptic number.

It is an amenable number.

19749678236 is a deficient number, since it is larger than the sum of its proper divisors (14822350276).

19749678236 is a wasteful number, since it uses less digits than its factorization.

19749678236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441660 (or 1441658 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 62.

The spelling of 19749678236 in words is "nineteen billion, seven hundred forty-nine million, six hundred seventy-eight thousand, two hundred thirty-six".