64015987 has 8 divisors (see below), whose sum is σ = 73230176. Its totient is φ = 54819072.

The previous prime is 64015979. The next prime is 64015993. The reversal of 64015987 is 78951046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64015987 - 2³ = 64015979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64015487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4963 + ... + 12355.

It is an arithmetic number, because the mean of its divisors is an integer number (9153772).

Almost surely, 2^64015987 is an apocalyptic number.

64015987 is a deficient number, since it is larger than the sum of its proper divisors (9214189).

64015987 is a wasteful number, since it uses less digits than its factorization.

64015987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8637.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 64015987 is about 8000.9991251093. Note that the first 3 decimals coincide. The cubic root of 64015987 is about 400.0333034771.

The spelling of 64015987 in words is "sixty-four million, fifteen thousand, nine hundred eighty-seven".