191628650 has 24 divisors (see below), whose sum is σ = 361318764. Its totient is φ = 75600000.

The previous prime is 191628631. The next prime is 191628653. The reversal of 191628650 is 56826191.

It is a Cunningham number, because it is equal to 13843²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 55696369 + 135932281 = 7463^2 + 11659^2 .

It is not an unprimeable number, because it can be changed into a prime (191628653) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 22601 + ... + 29900.

Almost surely, 2^191628650 is an apocalyptic number.

191628650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191628650 is a deficient number, since it is larger than the sum of its proper divisors (169690114).

191628650 is a wasteful number, since it uses less digits than its factorization.

191628650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52586 (or 52581 counting only the distinct ones).

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

The square root of 191628650 is about 13843.0000361193. Note that the first 4 decimals coincide. The cubic root of 191628650 is about 576.5276579563.

The spelling of 191628650 in words is "one hundred ninety-one million, six hundred twenty-eight thousand, six hundred fifty".