64878773 has 4 divisors (see below), whose sum is σ = 65508768. Its totient is φ = 64248780.

The previous prime is 64878763. The next prime is 64878799. The reversal of 64878773 is 37787846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64878773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64878703) 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, 314843 + ... + 315048.

It is an arithmetic number, because the mean of its divisors is an integer number (16377192).

Almost surely, 2^64878773 is an apocalyptic number.

It is an amenable number.

64878773 is a deficient number, since it is larger than the sum of its proper divisors (629995).

64878773 is a wasteful number, since it uses less digits than its factorization.

64878773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629994.

The product of its digits is 1580544, while the sum is 50.

The square root of 64878773 is about 8054.7360602319. The cubic root of 64878773 is about 401.8224610620.

The spelling of 64878773 in words is "sixty-four million, eight hundred seventy-eight thousand, seven hundred seventy-three".