64920085 has 4 divisors (see below), whose sum is σ = 77904108. Its totient is φ = 51936064.

The previous prime is 64920083. The next prime is 64920103. The reversal of 64920085 is 58002946.

It is a happy number.

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 14311089 + 50608996 = 3783^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 64920085 - 2¹ = 64920083 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 64920085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64920083) 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, 6492004 + ... + 6492013.

It is an arithmetic number, because the mean of its divisors is an integer number (19476027).

Almost surely, 2^64920085 is an apocalyptic number.

It is an amenable number.

64920085 is a deficient number, since it is larger than the sum of its proper divisors (12984023).

64920085 is a wasteful number, since it uses less digits than its factorization.

64920085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12984022.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 64920085 is about 8057.3001061150. The cubic root of 64920085 is about 401.9077306943.

The spelling of 64920085 in words is "sixty-four million, nine hundred twenty thousand, eighty-five".