199766628 has 24 divisors (see below), whose sum is σ = 517913760. Its totient is φ = 66588840.

The previous prime is 199766603. The next prime is 199766669. The reversal of 199766628 is 826667991.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924738 + ... + 924953.

It is an arithmetic number, because the mean of its divisors is an integer number (21579740).

Almost surely, 2^199766628 is an apocalyptic number.

199766628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

199766628 is an abundant number, since it is smaller than the sum of its proper divisors (318147132).

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

199766628 is a wasteful number, since it uses less digits than its factorization.

199766628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849704 (or 1849696 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 199766628 is about 14133.8822692139. The cubic root of 199766628 is about 584.5759978241.

The spelling of 199766628 in words is "one hundred ninety-nine million, seven hundred sixty-six thousand, six hundred twenty-eight".