18798729078 has 16 divisors (see below), whose sum is σ = 38471818176. Its totient is φ = 6120516360.

The previous prime is 18798729077. The next prime is 18798729091. The reversal of 18798729078 is 87092789781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18798729077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36431388 + ... + 36431903.

It is an arithmetic number, because the mean of its divisors is an integer number (2404488636).

Almost surely, 2^18798729078 is an apocalyptic number.

18798729078 is an abundant number, since it is smaller than the sum of its proper divisors (19673089098).

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

18798729078 is a wasteful number, since it uses less digits than its factorization.

18798729078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72863339.

The product of its (nonzero) digits is 28449792, while the sum is 66.

The spelling of 18798729078 in words is "eighteen billion, seven hundred ninety-eight million, seven hundred twenty-nine thousand, seventy-eight".