100115280 has 120 divisors (see below), whose sum is σ = 338326560. Its totient is φ = 26530560.

The previous prime is 100115269. The next prime is 100115287. The reversal of 100115280 is 82511001.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100115287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151591 + ... + 152249.

It is an arithmetic number, because the mean of its divisors is an integer number (2819388).

Almost surely, 2^100115280 is an apocalyptic number.

100115280 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 100115280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169163280).

100115280 is an abundant number, since it is smaller than the sum of its proper divisors (238211280).

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

100115280 is a wasteful number, since it uses less digits than its factorization.

100115280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 100115280 is about 10005.7623397720. The cubic root of 100115280 is about 464.3371756539.

Adding to 100115280 its reverse (82511001), we get a palindrome (182626281).

The spelling of 100115280 in words is "one hundred million, one hundred fifteen thousand, two hundred eighty".