191857793010 has 128 divisors (see below), whose sum is σ = 526152775680. Its totient is φ = 44354973696.

The previous prime is 191857792991. The next prime is 191857793011. The reversal of 191857793010 is 10397758191.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (191857793011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3145564 + ... + 3205976.

It is an arithmetic number, because the mean of its divisors is an integer number (4110568560).

Almost surely, 2^191857793010 is an apocalyptic number.

191857793010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 191857793010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263076387840).

191857793010 is an abundant number, since it is smaller than the sum of its proper divisors (334294982670).

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

191857793010 is a wasteful number, since it uses less digits than its factorization.

191857793010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60932.

The product of its (nonzero) digits is 476280, while the sum is 51.

The spelling of 191857793010 in words is "one hundred ninety-one billion, eight hundred fifty-seven million, seven hundred ninety-three thousand, ten".