199678770 has 120 divisors (see below), whose sum is σ = 571023684. Its totient is φ = 50056704.

The previous prime is 199678769. The next prime is 199678793. The reversal of 199678770 is 77876991.

It can be written as a sum of positive squares in 6 ways, for example, as 90497169 + 109181601 = 9513^2 + 10449^2 .

It is a super-2 number, since 2×199678770² = 79743222377425800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 233664 + ... + 234516.

Almost surely, 2^199678770 is an apocalyptic number.

199678770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199678770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285511842).

199678770 is an abundant number, since it is smaller than the sum of its proper divisors (371344914).

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

199678770 is a wasteful number, since it uses less digits than its factorization.

199678770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The square root of 199678770 is about 14130.7738641590. The cubic root of 199678770 is about 584.4902857948.

The spelling of 199678770 in words is "one hundred ninety-nine million, six hundred seventy-eight thousand, seven hundred seventy".