19494640792 has 64 divisors (see below), whose sum is σ = 42474378240. Its totient is φ = 8289907200.

The previous prime is 19494640769. The next prime is 19494640799. The reversal of 19494640792 is 29704649491.

It is a super-2 number, since 2×19494640792² (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 (19494640799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210817 + ... + 288847.

It is an arithmetic number, because the mean of its divisors is an integer number (663662160).

Almost surely, 2^19494640792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19494640792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21237189120).

19494640792 is an abundant number, since it is smaller than the sum of its proper divisors (22979737448).

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

19494640792 is a wasteful number, since it uses less digits than its factorization.

19494640792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78232 (or 78228 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 19494640792 in words is "nineteen billion, four hundred ninety-four million, six hundred forty thousand, seven hundred ninety-two".