100686240 has 240 divisors, whose sum is σ = 377064072. Its totient is φ = 25214976.

The previous prime is 100686197. The next prime is 100686253. The reversal of 100686240 is 42686001.

It can be written as a sum of positive squares in 4 ways, for example, as 99440784 + 1245456 = 9972^2 + 1116^2 .

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 220092 + ... + 220548.

Almost surely, 2^100686240 is an apocalyptic number.

100686240 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 100686240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188532036).

100686240 is an abundant number, since it is smaller than the sum of its proper divisors (276377832).

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

100686240 is a wasteful number, since it uses less digits than its factorization.

100686240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 100686240 is about 10034.2533354505. The cubic root of 100686240 is about 465.2182118391.

The spelling of 100686240 in words is "one hundred million, six hundred eighty-six thousand, two hundred forty".