19542634840 has 128 divisors (see below), whose sum is σ = 47807496000. Its totient is φ = 7172057088.

The previous prime is 19542634739. The next prime is 19542634897. The reversal of 19542634840 is 4843624591.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1840266 + ... + 1850854.

Almost surely, 2^19542634840 is an apocalyptic number.

19542634840 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 19542634840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23903748000).

19542634840 is an abundant number, since it is smaller than the sum of its proper divisors (28264861160).

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

19542634840 is a wasteful number, since it uses less digits than its factorization.

19542634840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10709 (or 10705 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 19542634840 in words is "nineteen billion, five hundred forty-two million, six hundred thirty-four thousand, eight hundred forty".