64978704 has 90 divisors (see below), whose sum is σ = 211562910. Its totient is φ = 18563328.

The previous prime is 64978681. The next prime is 64978717. The reversal of 64978704 is 40787946.

It can be written as a sum of positive squares in only one way, i.e., 45158400 + 19820304 = 6720^2 + 4452^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64978704.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 2452 + ... + 11660.

It is an arithmetic number, because the mean of its divisors is an integer number (2350699).

Almost surely, 2^64978704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64978704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105781455).

64978704 is an abundant number, since it is smaller than the sum of its proper divisors (146584206).

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

64978704 is a wasteful number, since it uses less digits than its factorization.

64978704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9237 (or 9221 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 64978704 is about 8060.9369182496. The cubic root of 64978704 is about 402.0286606135.

The spelling of 64978704 in words is "sixty-four million, nine hundred seventy-eight thousand, seven hundred four".