100288666 has 4 divisors (see below), whose sum is σ = 150433002. Its totient is φ = 50144332.

The previous prime is 100288663. The next prime is 100288673. The reversal of 100288666 is 666882001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 27783441 = 8515^2 + 5271^2 .

It is a super-5 number, since 5×100288666⁵ (a number of 41 digits) contains 55555 as substring. Note that it is a super-d number also for d = 3.

It is not an unprimeable number, because it can be changed into a prime (100288663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25072165 + ... + 25072168.

Almost surely, 2^100288666 is an apocalyptic number.

100288666 is a deficient number, since it is larger than the sum of its proper divisors (50144336).

100288666 is an equidigital number, since it uses as much as digits as its factorization.

100288666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50144335.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 100288666 is about 10014.4228989992. The cubic root of 100288666 is about 464.6050772603.

The spelling of 100288666 in words is "one hundred million, two hundred eighty-eight thousand, six hundred sixty-six".