100640605 has 8 divisors (see below), whose sum is σ = 130058712. Its totient is φ = 74319168.

The previous prime is 100640593. The next prime is 100640621. The reversal of 100640605 is 506046001.

It can be written as a sum of positive squares in 4 ways, for example, as 8076964 + 92563641 = 2842^2 + 9621^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 100640605 - 2²¹ = 98543453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774094 + ... + 774223.

It is an arithmetic number, because the mean of its divisors is an integer number (16257339).

Almost surely, 2^100640605 is an apocalyptic number.

It is an amenable number.

100640605 is a deficient number, since it is larger than the sum of its proper divisors (29418107).

100640605 is a wasteful number, since it uses less digits than its factorization.

100640605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548335.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 100640605 is about 10031.9791168044. The cubic root of 100640605 is about 465.1479160987.

Adding to 100640605 its reverse (506046001), we get a palindrome (606686606).

The spelling of 100640605 in words is "one hundred million, six hundred forty thousand, six hundred five".