64515287 has 4 divisors (see below), whose sum is σ = 64551816. Its totient is φ = 64478760.

The previous prime is 64515277. The next prime is 64515293. The reversal of 64515287 is 78251546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78251546 = 2 ⋅39125773.

It is a cyclic number.

It is not a de Polignac number, because 64515287 - 2⁶ = 64515223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64515287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64515277) 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, 15473 + ... + 19194.

It is an arithmetic number, because the mean of its divisors is an integer number (16137954).

Almost surely, 2^64515287 is an apocalyptic number.

64515287 is a deficient number, since it is larger than the sum of its proper divisors (36529).

64515287 is a wasteful number, since it uses less digits than its factorization.

64515287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36528.

The product of its digits is 67200, while the sum is 38.

The square root of 64515287 is about 8032.1408727686. The cubic root of 64515287 is about 401.0706463177.

The spelling of 64515287 in words is "sixty-four million, five hundred fifteen thousand, two hundred eighty-seven".