199778280 has 96 divisors (see below), whose sum is σ = 649049760. Its totient is φ = 49171200.

The previous prime is 199778279. The next prime is 199778287. The reversal of 199778280 is 82877991.

It is a super-2 number, since 2×199778280² = 79822722319516800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199778287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15355 + ... + 25205.

It is an arithmetic number, because the mean of its divisors is an integer number (6760935).

Almost surely, 2^199778280 is an apocalyptic number.

199778280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199778280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324524880).

199778280 is an abundant number, since it is smaller than the sum of its proper divisors (449271480).

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

199778280 is a wasteful number, since it uses less digits than its factorization.

199778280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9891 (or 9874 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 51.

The square root of 199778280 is about 14134.2944641747. The cubic root of 199778280 is about 584.5873633313.

The spelling of 199778280 in words is "one hundred ninety-nine million, seven hundred seventy-eight thousand, two hundred eighty".