199625728 has 44 divisors (see below), whose sum is σ = 400884480. Its totient is φ = 99356672.

The previous prime is 199625689. The next prime is 199625731. The reversal of 199625728 is 827526991.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391938 + ... + 392446.

Almost surely, 2^199625728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199625728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200442240).

199625728 is an abundant number, since it is smaller than the sum of its proper divisors (201258752).

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

199625728 is an equidigital number, since it uses as much as digits as its factorization.

199625728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 894 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The square root of 199625728 is about 14128.8969137721. The cubic root of 199625728 is about 584.4385271973.

The spelling of 199625728 in words is "one hundred ninety-nine million, six hundred twenty-five thousand, seven hundred twenty-eight".