19642494630 has 128 divisors (see below), whose sum is σ = 51889766400. Its totient is φ = 4719254400.

The previous prime is 19642494611. The next prime is 19642494647. The reversal of 19642494630 is 3649424691.

It is a self number, because there is not a number n which added to its sum of digits gives 19642494630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21373311 + ... + 21374229.

It is an arithmetic number, because the mean of its divisors is an integer number (405388800).

Almost surely, 2^19642494630 is an apocalyptic number.

19642494630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19642494630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25944883200).

19642494630 is an abundant number, since it is smaller than the sum of its proper divisors (32247271770).

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

19642494630 is a wasteful number, since it uses less digits than its factorization.

19642494630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450.

The product of its (nonzero) digits is 1119744, while the sum is 48.

The spelling of 19642494630 in words is "nineteen billion, six hundred forty-two million, four hundred ninety-four thousand, six hundred thirty".