64691285 has 8 divisors (see below), whose sum is σ = 77964120. Its totient is φ = 51529984.

The previous prime is 64691267. The next prime is 64691299. The reversal of 64691285 is 58219646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2328676 + 62362609 = 1526^2 + 7897^2 .

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 64691285 - 2¹⁰ = 64690261 is a prime.

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, 26600 + ... + 28929.

It is an arithmetic number, because the mean of its divisors is an integer number (9745515).

Almost surely, 2^64691285 is an apocalyptic number.

It is an amenable number.

64691285 is a deficient number, since it is larger than the sum of its proper divisors (13272835).

64691285 is a wasteful number, since it uses less digits than its factorization.

64691285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55767.

The product of its digits is 103680, while the sum is 41.

The square root of 64691285 is about 8043.0892696774. The cubic root of 64691285 is about 401.4350227014.

The spelling of 64691285 in words is "sixty-four million, six hundred ninety-one thousand, two hundred eighty-five".