19778678592 has 28 divisors (see below), whose sum is σ = 52331087616. Its totient is φ = 6592892800.

The previous prime is 19778678551. The next prime is 19778678599. The reversal of 19778678592 is 29587687791.

It is a super-2 number, since 2×19778678592² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19778678599) by changing a digit.

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, 51506784 + ... + 51507167.

Almost surely, 2^19778678592 is an apocalyptic number.

19778678592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19778678592 is an abundant number, since it is smaller than the sum of its proper divisors (32552409024).

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

19778678592 is a wasteful number, since it uses less digits than its factorization.

19778678592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103013966 (or 103013956 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 69.

The spelling of 19778678592 in words is "nineteen billion, seven hundred seventy-eight million, six hundred seventy-eight thousand, five hundred ninety-two".