1798729878 has 16 divisors (see below), whose sum is σ = 3924501696. Its totient is φ = 545069640.

The previous prime is 1798729859. The next prime is 1798729883. The reversal of 1798729878 is 8789278971.

It is a super-3 number, since 3×1798729878³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 27253483 = 1798729878 / (1 + 7 + 9 + 8 + 7 + 2 + 9 + 8 + 7 + 8).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13626676 + ... + 13626807.

It is an arithmetic number, because the mean of its divisors is an integer number (245281356).

Almost surely, 2^1798729878 is an apocalyptic number.

1798729878 is an abundant number, since it is smaller than the sum of its proper divisors (2125771818).

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

1798729878 is a wasteful number, since it uses less digits than its factorization.

1798729878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27253499.

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

The square root of 1798729878 is about 42411.4356984057. The cubic root of 1798729878 is about 1216.1542155484.

The spelling of 1798729878 in words is "one billion, seven hundred ninety-eight million, seven hundred twenty-nine thousand, eight hundred seventy-eight".