64665087 has 4 divisors (see below), whose sum is σ = 86220120. Its totient is φ = 43110056.

The previous prime is 64665071. The next prime is 64665089. The reversal of 64665087 is 78056646.

It is a happy number.

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 64665087 - 2⁴ = 64665071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64665089) 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, 10777512 + ... + 10777517.

It is an arithmetic number, because the mean of its divisors is an integer number (21555030).

Almost surely, 2^64665087 is an apocalyptic number.

64665087 is a deficient number, since it is larger than the sum of its proper divisors (21555033).

64665087 is a wasteful number, since it uses less digits than its factorization.

64665087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21555032.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 64665087 is about 8041.4605016751. The cubic root of 64665087 is about 401.3808257324.

The spelling of 64665087 in words is "sixty-four million, six hundred sixty-five thousand, eighty-seven".