64660487 has 4 divisors (see below), whose sum is σ = 65094600. Its totient is φ = 64226376.

The previous prime is 64660457. The next prime is 64660489. The reversal of 64660487 is 78406646.

64660487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 64660487 - 2¹⁸ = 64398343 is a prime.

It is a super-3 number, since 3×64660487³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64660489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216833 + ... + 217130.

It is an arithmetic number, because the mean of its divisors is an integer number (16273650).

Almost surely, 2^64660487 is an apocalyptic number.

64660487 is a deficient number, since it is larger than the sum of its proper divisors (434113).

64660487 is a wasteful number, since it uses less digits than its factorization.

64660487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434112.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 64660487 is about 8041.1744788930. The cubic root of 64660487 is about 401.3713079969.

The spelling of 64660487 in words is "sixty-four million, six hundred sixty thousand, four hundred eighty-seven".