189701781600 has 144 divisors (see below), whose sum is σ = 618858046800. Its totient is φ = 50474188800.

The previous prime is 189701781557. The next prime is 189701781601. The reversal of 189701781600 is 6187107981.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 189701781600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189701781601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 989580 + ... + 1165620.

It is an arithmetic number, because the mean of its divisors is an integer number (4297625325).

Almost surely, 2^189701781600 is an apocalyptic number.

189701781600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189701781600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309429023400).

189701781600 is an abundant number, since it is smaller than the sum of its proper divisors (429156265200).

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

189701781600 is a wasteful number, since it uses less digits than its factorization.

189701781600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176513 (or 176500 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 48.

The spelling of 189701781600 in words is "one hundred eighty-nine billion, seven hundred one million, seven hundred eighty-one thousand, six hundred".