100440644 has 12 divisors (see below), whose sum is σ = 180521964. Its totient is φ = 48862944.

The previous prime is 100440643. The next prime is 100440649. The reversal of 100440644 is 446044001.

It can be written as a sum of positive squares in 2 ways, for example, as 34668544 + 65772100 = 5888^2 + 8110^2 .

It is not an unprimeable number, because it can be changed into a prime (100440643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339179 + ... + 339474.

It is an arithmetic number, because the mean of its divisors is an integer number (15043497).

Almost surely, 2^100440644 is an apocalyptic number.

It is an amenable number.

100440644 is a deficient number, since it is larger than the sum of its proper divisors (80081320).

100440644 is a wasteful number, since it uses less digits than its factorization.

100440644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678694 (or 678692 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 100440644 is about 10022.0079824355. The cubic root of 100440644 is about 464.8396471799.

Adding to 100440644 its reverse (446044001), we get a palindrome (546484645).

The spelling of 100440644 in words is "one hundred million, four hundred forty thousand, six hundred forty-four".