64878071281 has 8 divisors (see below), whose sum is σ = 64948713984. Its totient is φ = 64807460160.

The previous prime is 64878071273. The next prime is 64878071287. The reversal of 64878071281 is 18217087846.

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

It is a cyclic number.

It is not a de Polignac number, because 64878071281 - 2³ = 64878071273 is a prime.

It is a super-2 number, since 2×64878071281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64878071287) 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 7 ways as a sum of consecutive naturals, for example, 8289336 + ... + 8297158.

It is an arithmetic number, because the mean of its divisors is an integer number (8118589248).

Almost surely, 2^64878071281 is an apocalyptic number.

It is an amenable number.

64878071281 is a deficient number, since it is larger than the sum of its proper divisors (70642703).

64878071281 is a wasteful number, since it uses less digits than its factorization.

64878071281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15791.

The product of its (nonzero) digits is 1204224, while the sum is 52.

The spelling of 64878071281 in words is "sixty-four billion, eight hundred seventy-eight million, seventy-one thousand, two hundred eighty-one".