64901605 has 4 divisors (see below), whose sum is σ = 77881932. Its totient is φ = 51921280.

The previous prime is 64901579. The next prime is 64901651. The reversal of 64901605 is 50610946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 53246209 = 3414^2 + 7297^2 .

It is not a de Polignac number, because 64901605 - 2⁷ = 64901477 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 6490156 + ... + 6490165.

It is an arithmetic number, because the mean of its divisors is an integer number (19470483).

Almost surely, 2^64901605 is an apocalyptic number.

It is an amenable number.

64901605 is a deficient number, since it is larger than the sum of its proper divisors (12980327).

64901605 is a wasteful number, since it uses less digits than its factorization.

64901605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12980326.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 64901605 is about 8056.1532383638. The cubic root of 64901605 is about 401.8695917027.

The spelling of 64901605 in words is "sixty-four million, nine hundred one thousand, six hundred five".