199979028 has 36 divisors (see below), whose sum is σ = 532109760. Its totient is φ = 63151056.

The previous prime is 199979023. The next prime is 199979029. The reversal of 199979028 is 820979991.

199979028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×199979028² = 79983223279649568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199979023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145500 + ... + 146867.

Almost surely, 2^199979028 is an apocalyptic number.

199979028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

199979028 is an abundant number, since it is smaller than the sum of its proper divisors (332130732).

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

199979028 is a wasteful number, since it uses less digits than its factorization.

199979028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292396 (or 292391 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The square root of 199979028 is about 14141.3941321215. The cubic root of 199979028 is about 584.7831060947.

The spelling of 199979028 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, twenty-eight".