64530987 has 4 divisors (see below), whose sum is σ = 86041320. Its totient is φ = 43020656.

The previous prime is 64530967. The next prime is 64531013. The reversal of 64530987 is 78903546.

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 64530987 - 2¹⁵ = 64498219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64530967) 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, 10755162 + ... + 10755167.

It is an arithmetic number, because the mean of its divisors is an integer number (21510330).

Almost surely, 2^64530987 is an apocalyptic number.

64530987 is a deficient number, since it is larger than the sum of its proper divisors (21510333).

64530987 is a wasteful number, since it uses less digits than its factorization.

64530987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21510332.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 64530987 is about 8033.1181368134. The cubic root of 64530987 is about 401.1031776175.

The spelling of 64530987 in words is "sixty-four million, five hundred thirty thousand, nine hundred eighty-seven".