19978767190 has 16 divisors (see below), whose sum is σ = 36095472720. Its totient is φ = 7961797600.

The previous prime is 19978767187. The next prime is 19978767223. The reversal of 19978767190 is 9176787991.

It is a super-2 number, since 2×19978767190² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 3710836 + ... + 3716215.

It is an arithmetic number, because the mean of its divisors is an integer number (2255967045).

Almost surely, 2^19978767190 is an apocalyptic number.

19978767190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19978767190 is a deficient number, since it is larger than the sum of its proper divisors (16116705530).

19978767190 is a wasteful number, since it uses less digits than its factorization.

19978767190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7427327.

The product of its (nonzero) digits is 12002256, while the sum is 64.

The spelling of 19978767190 in words is "nineteen billion, nine hundred seventy-eight million, seven hundred sixty-seven thousand, one hundred ninety".