100023564 has 12 divisors (see below), whose sum is σ = 233388344. Its totient is φ = 33341184.

The previous prime is 100023533. The next prime is 100023607. The reversal of 100023564 is 465320001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 100023564.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4167637 + ... + 4167660.

Almost surely, 2^100023564 is an apocalyptic number.

It is an amenable number.

100023564 is an abundant number, since it is smaller than the sum of its proper divisors (133364780).

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

100023564 is a wasteful number, since it uses less digits than its factorization.

100023564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8335304 (or 8335302 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 100023564 is about 10001.1781306004. The cubic root of 100023564 is about 464.1953386311.

Adding to 100023564 its reverse (465320001), we get a palindrome (565343565).

The spelling of 100023564 in words is "one hundred million, twenty-three thousand, five hundred sixty-four".