64694778 has 8 divisors (see below), whose sum is σ = 129389568. Its totient is φ = 21564924.

The previous prime is 64694771. The next prime is 64694801. The reversal of 64694778 is 87749646.

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

64694778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 64694778.

It is not an unprimeable number, because it can be changed into a prime (64694771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5391226 + ... + 5391237.

It is an arithmetic number, because the mean of its divisors is an integer number (16173696).

Almost surely, 2^64694778 is an apocalyptic number.

64694778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

64694778 is a wasteful number, since it uses less digits than its factorization.

64694778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10782468.

The product of its digits is 2032128, while the sum is 51.

The square root of 64694778 is about 8043.3064096800. The cubic root of 64694778 is about 401.4422477205.

The spelling of 64694778 in words is "sixty-four million, six hundred ninety-four thousand, seven hundred seventy-eight".