19005405640 has 32 divisors (see below), whose sum is σ = 46051561080. Its totient is φ = 7017380352.

The previous prime is 19005405613. The next prime is 19005405673. The reversal of 19005405640 is 4650450091.

It can be written as a sum of positive squares in 4 ways, for example, as 11556680004 + 7448725636 = 107502^2 + 86306^2 .

It is a super-2 number, since 2×19005405640² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19005405596 and 19005405605.

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, 18273909 + ... + 18274948.

Almost surely, 2^19005405640 is an apocalyptic number.

19005405640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19005405640 is an abundant number, since it is smaller than the sum of its proper divisors (27046155440).

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

19005405640 is a wasteful number, since it uses less digits than its factorization.

19005405640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36548881 (or 36548877 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 19005405640 in words is "nineteen billion, five million, four hundred five thousand, six hundred forty".