64778208 has 48 divisors (see below), whose sum is σ = 185504256. Its totient is φ = 19629440.

The previous prime is 64778191. The next prime is 64778221. The reversal of 64778208 is 80287746.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 64778208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29616 + ... + 31727.

It is an arithmetic number, because the mean of its divisors is an integer number (3864672).

Almost surely, 2^64778208 is an apocalyptic number.

It is an amenable number.

64778208 is an abundant number, since it is smaller than the sum of its proper divisors (120726048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64778208 is a wasteful number, since it uses less digits than its factorization.

64778208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61367 (or 61359 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 64778208 is about 8048.4910386979. The cubic root of 64778208 is about 401.6147394367.

The spelling of 64778208 in words is "sixty-four million, seven hundred seventy-eight thousand, two hundred eight".