19180458728 has 32 divisors (see below), whose sum is σ = 36201603360. Its totient is φ = 9526870080.

The previous prime is 19180458721. The next prime is 19180458761. The reversal of 19180458728 is 82785408191.

It is a super-2 number, since 2×19180458728² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19180458728.

It is not an unprimeable number, because it can be changed into a prime (19180458721) by changing a digit.

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, 912950 + ... + 933722.

It is an arithmetic number, because the mean of its divisors is an integer number (1131300105).

Almost surely, 2^19180458728 is an apocalyptic number.

It is an amenable number.

19180458728 is a deficient number, since it is larger than the sum of its proper divisors (17021144632).

19180458728 is a wasteful number, since it uses less digits than its factorization.

19180458728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21537 (or 21533 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 19180458728 in words is "nineteen billion, one hundred eighty million, four hundred fifty-eight thousand, seven hundred twenty-eight".