64878271 has 4 divisors (see below), whose sum is σ = 66387112. Its totient is φ = 63369432.

The previous prime is 64878269. The next prime is 64878313. The reversal of 64878271 is 17287846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17287846 = 2 ⋅8643923.

It is a cyclic number.

It is not a de Polignac number, because 64878271 - 2¹ = 64878269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1508797 = 64878271 / (6 + 4 + 8 + 7 + 8 + 2 + 7 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64878221) 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, 754356 + ... + 754441.

It is an arithmetic number, because the mean of its divisors is an integer number (16596778).

Almost surely, 2^64878271 is an apocalyptic number.

64878271 is a deficient number, since it is larger than the sum of its proper divisors (1508841).

64878271 is a wasteful number, since it uses less digits than its factorization.

64878271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508840.

The product of its digits is 150528, while the sum is 43.

The square root of 64878271 is about 8054.7048983808. The cubic root of 64878271 is about 401.8214246912.

The spelling of 64878271 in words is "sixty-four million, eight hundred seventy-eight thousand, two hundred seventy-one".