100644745 has 8 divisors (see below), whose sum is σ = 120924360. Its totient is φ = 80415360.

The previous prime is 100644707. The next prime is 100644749. The reversal of 100644745 is 547446001.

It can be written as a sum of positive squares in 4 ways, for example, as 36820624 + 63824121 = 6068^2 + 7989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100644745 - 2¹⁵ = 100611977 is a prime.

It is a super-2 number, since 2×100644745² = 20258729392230050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100644749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7996 + ... + 16285.

It is an arithmetic number, because the mean of its divisors is an integer number (15115545).

Almost surely, 2^100644745 is an apocalyptic number.

It is an amenable number.

100644745 is a deficient number, since it is larger than the sum of its proper divisors (20279615).

100644745 is an equidigital number, since it uses as much as digits as its factorization.

100644745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25115.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 100644745 is about 10032.1854548249. The cubic root of 100644745 is about 465.1542941935.

The spelling of 100644745 in words is "one hundred million, six hundred forty-four thousand, seven hundred forty-five".