64994515 has 4 divisors (see below), whose sum is σ = 77993424. Its totient is φ = 51995608.

The previous prime is 64994513. The next prime is 64994537. The reversal of 64994515 is 51549946.

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 64994515 - 2¹ = 64994513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64994513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6499447 + ... + 6499456.

It is an arithmetic number, because the mean of its divisors is an integer number (19498356).

Almost surely, 2^64994515 is an apocalyptic number.

64994515 is a deficient number, since it is larger than the sum of its proper divisors (12998909).

64994515 is a wasteful number, since it uses less digits than its factorization.

64994515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12998908.

The product of its digits is 194400, while the sum is 43.

The square root of 64994515 is about 8061.9175758625. The cubic root of 64994515 is about 402.0612659609.

The spelling of 64994515 in words is "sixty-four million, nine hundred ninety-four thousand, five hundred fifteen".