1778899998 has 16 divisors (see below), whose sum is σ = 3558222720. Its totient is φ = 592896216.

The previous prime is 1778899979. The next prime is 1778899999. The reversal of 1778899998 is 8999988771.

1778899998 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778899999) 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, 72783 + ... + 94101.

It is an arithmetic number, because the mean of its divisors is an integer number (222388920).

Almost surely, 2^1778899998 is an apocalyptic number.

1778899998 is an abundant number, since it is smaller than the sum of its proper divisors (1779322722).

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

1778899998 is a wasteful number, since it uses less digits than its factorization.

1778899998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35231.

The product of its digits is 164602368, while the sum is 75.

The square root of 1778899998 is about 42177.0079308620. The cubic root of 1778899998 is about 1211.6685761226.

The spelling of 1778899998 in words is "one billion, seven hundred seventy-eight million, eight hundred ninety-nine thousand, nine hundred ninety-eight".