64780605 has 24 divisors (see below), whose sum is σ = 112713432. Its totient is φ = 34418304.

The previous prime is 64780603. The next prime is 64780609. The reversal of 64780605 is 50608746.

It is a happy number.

64780605 is a `hidden beast` number, since 6 + 47 + 8 + 0 + 605 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 956484 + 63824121 = 978^2 + 7989^2 .

It is not a de Polignac number, because 64780605 - 2¹ = 64780603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64780605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64780603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9867 + ... + 15063.

It is an arithmetic number, because the mean of its divisors is an integer number (4696393).

Almost surely, 2^64780605 is an apocalyptic number.

It is an amenable number.

64780605 is a deficient number, since it is larger than the sum of its proper divisors (47932827).

64780605 is a wasteful number, since it uses less digits than its factorization.

64780605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485 (or 5482 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 64780605 is about 8048.6399472209. The cubic root of 64780605 is about 401.6196930504.

The spelling of 64780605 in words is "sixty-four million, seven hundred eighty thousand, six hundred five".