19642600340 has 72 divisors (see below), whose sum is σ = 45442087656. Its totient is φ = 7126732800.

The previous prime is 19642600321. The next prime is 19642600381. The reversal of 19642600340 is 4300624691.

It can be written as a sum of positive squares in 4 ways, for example, as 3745929616 + 15896670724 = 61204^2 + 126082^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19642600340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1097060 + ... + 1114820.

Almost surely, 2^19642600340 is an apocalyptic number.

19642600340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19642600340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22721043828).

19642600340 is an abundant number, since it is smaller than the sum of its proper divisors (25799487316).

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

19642600340 is a wasteful number, since it uses less digits than its factorization.

19642600340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18249 (or 18236 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 19642600340 in words is "nineteen billion, six hundred forty-two million, six hundred thousand, three hundred forty".