191628560 has 20 divisors (see below), whose sum is σ = 445536588. Its totient is φ = 76651392.

The previous prime is 191628553. The next prime is 191628601. The reversal of 191628560 is 65826191.

191628560 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43665664 + 147962896 = 6608^2 + 12164^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 1197599 + ... + 1197758.

Almost surely, 2^191628560 is an apocalyptic number.

191628560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191628560 is an abundant number, since it is smaller than the sum of its proper divisors (253908028).

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

191628560 is a wasteful number, since it uses less digits than its factorization.

191628560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395370 (or 2395364 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 191628560 is about 13842.9967853785. The cubic root of 191628560 is about 576.5275676992.

The spelling of 191628560 in words is "one hundred ninety-one million, six hundred twenty-eight thousand, five hundred sixty".