100780 has 12 divisors (see below), whose sum is σ = 211680. Its totient is φ = 40304.

The previous prime is 100769. The next prime is 100787. The reversal of 100780 is 87001.

100780 is nontrivially palindromic in base 12.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (100787) by changing a digit.

100780 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2¹⁰⁰⁷⁸⁰ is an apocalyptic number.

100780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100780 is an abundant number, since it is smaller than the sum of its proper divisors (110900).

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

100780 is a wasteful number, since it uses less digits than its factorization.

100780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048 (or 5046 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 100780 is about 317.4586587258. The cubic root of 100780 is about 46.5362572270.

Adding to 100780 its reverse (87001), we get a palindrome (187781).

The spelling of 100780 in words is "one hundred thousand, seven hundred eighty".