123601780 has 48 divisors (see below), whose sum is σ = 268418304. Its totient is φ = 47779200.

The previous prime is 123601769. The next prime is 123601817. The reversal of 123601780 is 87106321.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86149 + ... + 87571.

It is an arithmetic number, because the mean of its divisors is an integer number (5592048).

Almost surely, 2^123601780 is an apocalyptic number.

123601780 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 123601780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134209152).

123601780 is an abundant number, since it is smaller than the sum of its proper divisors (144816524).

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

123601780 is a wasteful number, since it uses less digits than its factorization.

123601780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576 (or 1574 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 123601780 is about 11117.6337410440. The cubic root of 123601780 is about 498.1287119658.

The spelling of 123601780 in words is "one hundred twenty-three million, six hundred one thousand, seven hundred eighty".