64981285 has 4 divisors (see below), whose sum is σ = 77977548. Its totient is φ = 51985024.

The previous prime is 64981253. The next prime is 64981289. The reversal of 64981285 is 58218946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58218946 = 2 ⋅29109473.

It can be written as a sum of positive squares in 2 ways, for example, as 7963684 + 57017601 = 2822^2 + 7551^2 .

It is a cyclic number.

It is not a de Polignac number, because 64981285 - 2⁵ = 64981253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64981289) 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, 6498124 + ... + 6498133.

It is an arithmetic number, because the mean of its divisors is an integer number (19494387).

Almost surely, 2^64981285 is an apocalyptic number.

It is an amenable number.

64981285 is a deficient number, since it is larger than the sum of its proper divisors (12996263).

64981285 is a wasteful number, since it uses less digits than its factorization.

64981285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12996262.

The product of its digits is 138240, while the sum is 43.

The square root of 64981285 is about 8061.0970097128. The cubic root of 64981285 is about 402.0339834971.

The spelling of 64981285 in words is "sixty-four million, nine hundred eighty-one thousand, two hundred eighty-five".